Research Project: Transmission, Differentiation, and Pathobiology of
Transmissible Spongiform Encephalopathies 2014 Annual Report
1a.Objectives (from AD-416): 1. Investigate the pathobiology of atypical
transmissible spongiform encephalopathies (TSEs) in natural hosts. A.
Investigate the pathobiology of atypical scrapie. B. Investigate the
pathobiology of atypical bovine spongiform encephalopathy (BSE). 2. Investigate
the horizontal transmission of TSEs. A. Assess the horizontal transmission of
sheep scrapie in the absence of lambing. B. Determine routes of transmission in
chronic wasting disease (CWD) infected premises. C. Assess oral transmission of
CWD in reindeer. 3. Investigate determinants of CWD persistence. A. Determine
CWD host range using natural routes of transmission. B. Investigate the
pathobiology of CWD.
1b.Approach (from AD-416): The studies will focus on three animal
transmissible spongiform encephalopathy (TSE) agents found in the United States:
bovine spongiform encephalopathy (BSE); scrapie of sheep and goats; and chronic
wasting disease (CWD) of deer, elk, and moose. The research will address sites
of accumulation, routes of infection, environmental persistence, and ante mortem
diagnostics with an emphasis on controlled conditions and natural routes of
infection. Techniques used will include clinical exams, histopathology,
immunohistochemistry and biochemical analysis of proteins. The enhanced
knowledge gained from this work will help mitigate the potential for
unrecognized epidemic expansions of these diseases in populations of animals
that could either directly or indirectly affect food animals.
3.Progress Report: Research efforts directed toward meeting objective 1 of
our project plan, Investigate the pathobiology of atypical transmissible
spongiform encephalopathies (TSEs) in natural hosts, include work in previous
years starting with the inoculation of animals for studies designed to address
the pathobiology of atypical scrapie, atypical bovine spongiform encephalopathy
(BSE), as well as a genetic version of BSE. Animals inoculated with atypical
scrapie have not yet developed disease. Atypical BSE animals have developed
disease and evaluation of the samples is currently underway. Animals inoculated
with a genetic version of BSE have developed disease and the manuscript has been
published (2012). In addition, we have investigated the possibility that
atypical scrapie was present earlier than previously detected in the national
flock by analyzing archived field isolates using methods that were unavailable
at the time of original diagnosis. Sample quality was sufficiently degraded that
modern methods were not suitable for evaluation. In research pertaining to
objective 2, Investigate the horizontal transmission of TSEs, we have initiated
a study to determine if cohousing non-lambing scrapie inoculated sheep is
sufficient to transmit scrapie to neonatal lambs. At this time, scrapie free
ewes have lambed in the presence of scrapie inoculated animals and the lambs are
cohoused with these inoculated animals.
4.Accomplishments 1. Evaluated enzyme immunoassay for rapid identification
of prion disease in livestock. Scrapie of sheep and bovine spongiform
encephalopathy of cattle are diseases that cause damage to the central nervous
system including the retina in the eye. The infectious agent is an abnormal
protein called a prion that has misfolded from its normal state and is resistant
to breakdown by the host cells. Current diagnostic methods require the testing
of brain material, which can be difficult to collect and may lead to
contamination of the environment and exposure of personnel to the infectious
agent. Eyes can be readily collected without opening the skull. ARS researchers
at Ames, Iowa demonstrated that the enzyme immunoassay results using eyes of
negative controls or samples collected from sheep or cattle with clinical signs
were in agreement with approved confirmatory assays (western blot or
immunohistochemistry). These results indicate the retina is a useful tissue for
rapid diagnosis of prion disease in clinically ill sheep and cattle and could be
considered to greatly increase the number of samples submitted for prion disease
diagnosis with a minimal investment of time and limited exposure of personnel to
prion agents.
2. Evaluated E211K cattle as a model for inherited human prion disease.
Prion diseases cause damage to the central nervous system of animals and humans.
The infectious agent is an abnormal protein called a prion that has misfolded
from its normal state and is resistant to breakdown by the host cells and thus
accumulates and damages those cells. Some forms of prion disease are genetic and
can be inherited. Current models of genetic prion disease in humans rely on
mouse models expressing either the human prion protein (E200K) or a combination
of both mouse and human sequences. In addition to being an entirely artificial
system these mouse models have a short lifespan making them a less than ideal
system to study a naturally occurring genetic disorder with a long incubation
time and late onset of disease. Cattle, however, exhibit a number of
similarities to humans with regard to prion disease and perhaps most notable is
the late onset of genetic prion disease. ARS researchers at Ames, Iowa have
produced cattle containing both 1 and 2 chromosome copies of the cattle prion
gene (E211K) and evaluated many aspects of this prion protein from cattle
including protein stability, protein expression levels and ratios, as well as
evidence of oxidative stress. Taken together, these results highlight the
differences between mouse models of genetic prion disease and a naturally
occurring prion disease system in cattle and suggest that cattle will provide a
more relevant understanding of genetic prion disease in humans than do current
rodent models.
Review Publications
Smith, J.D., Greenlee, J.J. 2014. Detection of misfolded prion protein in
retina samples of sheep and cattle by use of a commercially available enzyme
immunoassay. American Journal of Veterinary Research. 75(3):268-272.
Haldar, S., Beveridge, A.J., Wong, J., Singh, A.J., Galimberti, D.,
Borroni, D., Zhu, X., Blevins, J., Greenlee, J., Perry, G., Mukhopadhyay, C.K.,
Schmotzer, C., Singh, N. 2014. A low-molecular-weight ferroxidase is increased
in the CSF of sCJD Cases: CSF ferroxidase and transferrin as diagnostic
biomarkers for sCJD. Antioxidants & Redox Signaling. 19(14):1662-1675.
Research Project: TRANSMISSION, DIFFERENTIATION, AND PATHOBIOLOGY OF
TRANSMISSIBLE SPONGIFORM ENCEPHALOPATHIES Title: Evaluation of the zoonotic
potential of transmissible mink encephalopathy
Authors
item Comoy, Emmanuel - item Mikol, Jacqueline - item Ruchoux,
Marie-Madeleine - item Durand, Valerie - item Luccantoni-Freire, Sophie - item
Dehen, Capucine - item Correia, Evelyne - item Casalone, Cristina - item Richt,
Juergen item Greenlee, Justin item Torres, Juan Maria - item Brown, Paul - item
Deslys, Jean-Philippe -
Submitted to: Pathogens Publication Type: Peer Reviewed Journal Publication
Acceptance Date: July 30, 2013 Publication Date: July 30, 2013 Citation: Comoy,
E.E., Mikol, J., Ruchoux, M., Durand, V., Luccantoni-Freire, S., Dehen, C.,
Correia, E., Casalone, C., Richt, J.A., Greenlee, J.J., Torres, J.M., Brown, P.,
Deslys, J. 2013. Evaluation of the zoonotic potential of transmissible mink
encephalopathy. Pathogens. 2:(3)520-532.
Interpretive Summary: Cases of bovine spongiform encephalopathy (BSE) or
mad cow disease can be subclassified into at least 3 distinct disease forms with
the predominate form known as classical BSE and the others collectively referred
to as atypical BSE. Atypical BSE can be further subdivided into H-type and
L-type cases that are distinct from classical BSE and from each other. Both of
the atypical BSE subtypes are believed to occur spontaneously, whereas classical
BSE is spread through feeding contaminated meat and bone meal to cattle.
Transmissible mink encephalopathy (TME) is another prion disease that transmits
to cattle and show similarities to L-type BSE when subjected to laboratory
testing. The purpose of this study was to use non-human primates (cynomologous
macaque) and transgenic mice expressing the human prion protein to determine if
TME could represent a potential risk to human health. TME from two sources
(cattle and raccoons) was able to infect non-human primates and transgenic mice
after exposure by the intracranial route. This result suggest that humans may be
able to replicate TME prions after an exposure that allows infectious material
access to brain tissue. At this time, it is unknown whether non-human primates
or transgenic mice would be susceptible to TME prions after oral exposure. The
results obtained in these animal models were similar to those obtained for
L-type BSE. Although rare, the existence of TME and that it transmits to cattle,
non-human primates, and transgenic mice suggest that feed bans preventing the
feeding of mammalian tissues to cattle should stay in place and that regular
prion surveillance during the slaughter should remain in place. Parties with
interest in the cattle and beef industries and regulatory officials responsible
for safe feeding practices of cattle will be interested in this work. Technical
Abstract: Successful transmission of Transmissible Mink Encephalopathy (TME) to
cattle supports the bovine hypothesis to the still controversial origin of TME
outbreaks. Human and primate susceptibility to classical Bovine Spongiform
Encephalopathy (c-BSE) and the transmissibility of L-type BSE to macaques assume
a low cattle-to-primate species barrier: we therefore evaluated the zoonotic
potential of cattle-adapted TME. In less than two years, this strain induced in
cynomolgus macaques a neurological disease similar to L-BSE and distinct from
c-BSE. TME derived from another donor species (raccoon) induced a similar
disease with shorter incubation periods. L-BSE and cattle-adapted TME were also
transmissible to transgenic mice expressing human PrP. Interestingly, secondary
transmissions to transgenic mice expressing bovine PrP showed the maintenance of
prion strain features for the three tested bovine prion strains (cattle TME,
c-BSE and L-BSE) regardless of intermediate host. Thus, TME is the third animal
prion strain transmissible to both macaques and humanized transgenic mice,
suggesting zoonotic potentials that should be considered in the risk analysis of
animal prion diseases for human health. Moreover, the similarities between TME
and L-BSE are highly suggestive of a link between those strains, and of the
presence of L-BSE decades prior to its identification in USA and Europe.
IF, spontaneous BSE was ever to be proven, it would be the industry and
consumer’s worst nightmare. you could never ever eradicate mad cow disease, no
matter how hard you try, the risk factor for human mad cow disease from
consumption or friendly fire (IATROGENIC) would always be there. ...TSS
*** Singeltary reply ; Molecular, Biochemical and Genetic Characteristics
of BSE in Canada Singeltary reply ;
LET'S take a closer look at this new prionpathy or prionopathy, and then
let's look at the g-h-BSEalabama mad cow. This new prionopathy in humans? the
genetic makeup is IDENTICAL to the g-h-BSEalabama mad cow, the only _documented_
mad cow in the world to date like this, ......wait, it get's better. this new
prionpathy is killing young and old humans, with LONG DURATION from onset of
symptoms to death, and the symptoms are very similar to nvCJD victims, OH, and
the plaques are very similar in some cases too, bbbut, it's not related to the
g-h-BSEalabama cow, WAIT NOW, it gets even better, the new human prionpathy that
they claim is a genetic TSE, has no relation to any gene mutation in that
family. daaa, ya think it could be related to that mad cow with the same genetic
make-up ??? there were literally tons and tons of banned mad cow protein in
Alabama in commerce, and none of it transmitted to cows, and the cows to humans
there from ??? r i g h t $$$ ALABAMA MAD COW g-h-BSEalabama In this study, we
identified a novel mutation in the bovine prion protein gene (Prnp), called
E211K, of a confirmed BSE positive cow from Alabama, United States of America.
This mutation is identical to the E200K pathogenic mutation found in humans with
a genetic form of CJD. This finding represents the first report of a confirmed
case of BSE with a potential pathogenic mutation within the bovine Prnp gene. We
hypothesize that the bovine Prnp E211K mutation most likely has caused BSE in
"the approximately 10-year-old cow" carrying the E221K mutation.
Saturday, August 14, 2010
BSE Case Associated with Prion Protein Gene Mutation (g-h-BSEalabama) and
VPSPr PRIONPATHY (see mad cow feed in COMMERCE IN ALABAMA...TSS)
her healthy calf also carried the mutation
(J. A. Richt and S. M. Hall PLoS Pathog. 4, e1000156; 2008).
This raises the possibility that the disease could occasionally be genetic
in origin. Indeed, the report of the UK BSE Inquiry in 2000 suggested that the
UK epidemic had most likely originated from such a mutation and argued against
the scrapierelated assumption. Such rare potential pathogenic PRNP mutations
could occur in countries at present considered to be free of BSE, such as
Australia and New Zealand. So it is important to maintain strict surveillance
for BSE in cattle, with rigorous enforcement of the ruminant feed ban (many
countries still feed ruminant proteins to pigs). Removal of specified risk
material, such as brain and spinal cord, from cattle at slaughter prevents
infected material from entering the human food chain. Routine genetic screening
of cattle for PRNP mutations, which is now available, could provide additional
data on the risk to the public. Because the point mutation identified in the
Alabama animals is identical to that responsible for the commonest type of
familial (genetic) CJD in humans, it is possible that the resulting infective
prion protein might cross the bovine-human species barrier more easily. Patients
with vCJD continue to be identified. The fact that this is happening less often
should not lead to relaxation of the controls necessary to prevent future
outbreaks.
Malcolm A. Ferguson-Smith Cambridge University Department of Veterinary
Medicine, Madingley Road, Cambridge CB3 0ES, UK e-mail: maf12@cam.ac.uk Jürgen
A. Richt College of Veterinary Medicine, Kansas State University, K224B Mosier
Hall, Manhattan, Kansas 66506-5601, USA NATURE|Vol 457|26 February 2009
BANNED MAD COW FEED IN COMMERCE IN ALABAMA
______________________________
PRODUCT
a) EVSRC Custom dairy feed, Recall # V-130-6;
b) Performance Chick Starter, Recall # V-131-6;
c) Performance Quail Grower, Recall # V-132-6;
d) Performance Pheasant Finisher, Recall # V-133-6.
CODE
None
RECALLING FIRM/MANUFACTURER
Donaldson & Hasenbein/dba J&R Feed Service, Inc., Cullman, AL, by
telephone on June 23, 2006 and by letter dated July 19, 2006. Firm initiated
recall is complete.
REASON
Dairy and poultry feeds were possibly contaminated with ruminant based
protein.
VOLUME OF PRODUCT IN COMMERCE
477.72 tons
DISTRIBUTION
AL
______________________________
PRODUCT
a) Dairy feed, custom, Recall # V-134-6;
b) Custom Dairy Feed with Monensin, Recall # V-135-6.
CODE
None. Bulk product
RECALLING FIRM/MANUFACTURER
Recalling Firm: Burkmann Feed, Greeneville, TN, by Telephone beginning on
June 28, 2006.
Manufacturer: H. J. Baker & Bro., Inc., Albertville, AL. Firm initiated
recall is complete.
REASON
Possible contamination of dairy feeds with ruminant derived meat and bone
meal.
VOLUME OF PRODUCT IN COMMERCE
1,484 tons
DISTRIBUTION
TN and WV
END OF ENFORCEMENT REPORT FOR SEPTEMBER 6, 2006
###
RECALLS AND FIELD CORRECTIONS: VETERINARY MEDICINE - CLASS II
______________________________
PRODUCT
Bulk custom made dairy feed, Recall # V-115-6
CODE
None
RECALLING FIRM/MANUFACTURER
Hiseville Feed & Seed Co., Hiseville, KY, by telephone and letter on or
about July 14, 2006. FDA initiated recall is ongoing.
REASON
Custom made feeds contain ingredient called Pro-Lak which may contain
ruminant derived meat and bone meal.
VOLUME OF PRODUCT IN COMMERCE
Approximately 2,223 tons
DISTRIBUTION
KY
______________________________
PRODUCT
Bulk custom made dairy feed, Recall # V-116-6
CODE
None
RECALLING FIRM/MANUFACTURER
Rips Farm Center, Tollesboro, KY, by telephone and letter on July 14, 2006.
FDA initiated recall is ongoing.
REASON
Custom made feeds contain ingredient called Pro-Lak which may contain
ruminant derived meat and bone meal.
VOLUME OF PRODUCT IN COMMERCE
1,220 tons
DISTRIBUTION
KY
______________________________
PRODUCT
Bulk custom made dairy feed, Recall # V-117-6
CODE
None
RECALLING FIRM/MANUFACTURER
Kentwood Co-op, Kentwood, LA, by telephone on June 27, 2006. FDA initiated
recall is completed.
REASON
Possible contamination of animal feed ingredients, including ingredients
that are used in feed for dairy animals, with ruminant derived meat and bone
meal.
VOLUME OF PRODUCT IN COMMERCE
40 tons
DISTRIBUTION
LA and MS
______________________________
PRODUCT
Bulk Dairy Feed, Recall V-118-6
CODE
None
RECALLING FIRM/MANUFACTURER
Cal Maine Foods, Inc., Edwards, MS, by telephone on June 26, 2006. FDA
initiated recall is complete.
REASON
Possible contamination of animal feed ingredients, including ingredients
that are used in feed for dairy animals, with ruminant derived meat and bone
meal.
VOLUME OF PRODUCT IN COMMERCE
7,150 tons
DISTRIBUTION
MS
______________________________
PRODUCT
Bulk custom dairy pre-mixes, Recall # V-119-6
CODE
None
RECALLING FIRM/MANUFACTURER
Walthall County Co-op, Tylertown, MS, by telephone on June 26, 2006. Firm
initiated recall is complete.
REASON
Possible contamination of dairy animal feeds with ruminant derived meat and
bone meal.
VOLUME OF PRODUCT IN COMMERCE
87 tons
DISTRIBUTION
MS
______________________________
PRODUCT
Bulk custom dairy pre-mixes, Recall # V-120-6
CODE
None
RECALLING FIRM/MANUFACTURER
Ware Milling Inc., Houston, MS, by telephone on June 23, 2006. Firm
initiated recall is complete.
REASON
Possible contamination of dairy animal feeds with ruminant derived meat and
bone meal.
VOLUME OF PRODUCT IN COMMERCE
350 tons
DISTRIBUTION
AL and MS
______________________________
PRODUCT
a) Tucker Milling, LLC Tm 32% Sinking Fish Grower, #2680-Pellet,
50 lb. bags, Recall # V-121-6;
b) Tucker Milling, LLC #31120, Game Bird Breeder Pellet,
50 lb. bags, Recall # V-122-6;
c) Tucker Milling, LLC #31232 Game Bird Grower,
50 lb. bags, Recall # V-123-6;
d) Tucker Milling, LLC 31227-Crumble, Game Bird Starter, BMD Medicated, 50
lb bags, Recall # V-124-6;
e) Tucker Milling, LLC #31120, Game Bird Breeder, 50 lb bags, Recall #
V-125-6;
f) Tucker Milling, LLC #30230, 30 % Turkey Starter, 50 lb bags, Recall #
V-126-6;
g) Tucker Milling, LLC #30116, TM Broiler Finisher, 50 lb bags, Recall #
V-127-6
CODE
All products manufactured from 02/01/2005 until 06/20/2006
RECALLING FIRM/MANUFACTURER
Recalling Firm: Tucker Milling LLC, Guntersville, AL, by telephone and
visit on June 20, 2006, and by letter on June 23, 2006.
Manufacturer: H. J. Baker and Brothers Inc., Stamford, CT. Firm initiated
recall is ongoing.
REASON
Poultry and fish feeds which were possibly contaminated with ruminant based
protein were not labeled as "Do not feed to ruminants".
VOLUME OF PRODUCT IN COMMERCE
7,541-50 lb bags
DISTRIBUTION
AL, GA, MS, and TN
END OF ENFORCEMENT REPORT FOR AUGUST 9, 2006
###
Subject: MAD COW FEED RECALL AL AND FL VOLUME OF PRODUCT IN COMMERCE 125
TONS Products manufactured from 02/01/2005 until 06/06/2006
Date: August 6, 2006 at 6:16 pm PST PRODUCT
a) CO-OP 32% Sinking Catfish, Recall # V-100-6;
b) Performance Sheep Pell W/Decox/A/N, medicated, net wt. 50 lbs, Recall #
V-101-6;
c) Pro 40% Swine Conc Meal -- 50 lb, Recall # V-102-6;
d) CO-OP 32% Sinking Catfish Food Medicated, Recall # V-103-6;
*** e) "Big Jim's" BBB Deer Ration, Big Buck Blend, Recall # V-104-6;
f) CO-OP 40% Hog Supplement Medicated Pelleted, Tylosin 100 grams/ton, 50
lb. bag, Recall # V-105-6;
g) Pig Starter Pell II, 18% W/MCDX Medicated 282020, Carbadox -- 0.0055%,
Recall # V-106-6;
h) CO-OP STARTER-GROWER CRUMBLES, Complete Feed for Chickens from Hatch to
20 Weeks, Medicated, Bacitracin Methylene Disalicylate, 25 and 50 Lbs, Recall #
V-107-6;
i) CO-OP LAYING PELLETS, Complete Feed for Laying Chickens, Recall # 108-6;
j) CO-OP LAYING CRUMBLES, Recall # V-109-6;
k) CO-OP QUAIL FLIGHT CONDITIONER MEDICATED, net wt 50 Lbs, Recall #
V-110-6;
l) CO-OP QUAIL STARTER MEDICATED, Net Wt. 50 Lbs, Recall # V-111-6;
m) CO-OP QUAIL GROWER MEDICATED, 50 Lbs, Recall # V-112-6 CODE
Product manufactured from 02/01/2005 until 06/06/2006
RECALLING FIRM/MANUFACTURER Alabama Farmers Cooperative, Inc., Decatur, AL,
by telephone, fax, email and visit on June 9, 2006. FDA initiated recall is
complete.
REASON Animal and fish feeds which were possibly contaminated with ruminant
based protein not labeled as "Do not feed to ruminants".
VOLUME OF PRODUCT IN COMMERCE 125 tons
DISTRIBUTION AL and FL
END OF ENFORCEMENT REPORT FOR AUGUST 2, 2006
###
MAD COW FEED RECALL USA EQUALS 10,878.06 TONS NATIONWIDE Sun Jul 16, 2006
09:22 71.248.128.67
RECALLS AND FIELD CORRECTIONS: VETERINARY MEDICINE -- CLASS II
______________________________
PRODUCT
a) PRO-LAK, bulk weight, Protein Concentrate for Lactating Dairy Animals,
Recall # V-079-6;
b) ProAmino II, FOR PREFRESH AND LACTATING COWS, net weight 50lb (22.6 kg),
Recall # V-080-6;
c) PRO-PAK, MARINE & ANIMAL PROTEIN CONCENTRATE FOR USE IN ANIMAL FEED,
Recall # V-081-6;
d) Feather Meal, Recall # V-082-6 CODE
a) Bulk
b) None
c) Bulk
d) Bulk
RECALLING FIRM/MANUFACTURER H. J. Baker & Bro., Inc., Albertville, AL,
by telephone on June 15, 2006 and by press release on June 16, 2006. Firm
initiated recall is ongoing.
REASON
Possible contamination of animal feeds with ruminent derived meat and bone
meal.
VOLUME OF PRODUCT IN COMMERCE 10,878.06 tons
DISTRIBUTION Nationwide
END OF ENFORCEMENT REPORT FOR July 12, 2006
###
what about that ALABAMA MAD COW, AND MAD COW FEED THERE FROM IN THAT STATE
???
Saturday, August 14, 2010
BSE Case Associated with Prion Protein Gene Mutation (g-h-BSEalabama) and
VPSPr PRIONPATHY
*** (see mad cow feed in COMMERCE IN ALABAMA...TSS)
BANNED MAD COW FEED IN COMMERCE IN ALABAMA
Date: September 6, 2006 at 7:58 am PST PRODUCT
a) EVSRC Custom dairy feed, Recall # V-130-6;
b) Performance Chick Starter, Recall # V-131-6;
c) Performance Quail Grower, Recall # V-132-6;
d) Performance Pheasant Finisher, Recall # V-133-6.
CODE None RECALLING FIRM/MANUFACTURER Donaldson & Hasenbein/dba J&R
Feed Service, Inc., Cullman, AL, by telephone on June 23, 2006 and by letter
dated July 19, 2006. Firm initiated recall is complete.
REASON
Dairy and poultry feeds were possibly contaminated with ruminant based
protein.
VOLUME OF PRODUCT IN COMMERCE 477.72 tons
DISTRIBUTION AL
______________________________
Saturday, August 14, 2010
BSE Case Associated with Prion Protein Gene Mutation (g-h-BSEalabama) and
VPSPr PRIONPATHY (see mad cow feed in COMMERCE IN ALABAMA...TSS)
Saturday, August 4, 2012
*** Final Feed Investigation Summary – California Atypical L-type BSE Case
- July 2012 ***
Saturday, June 25, 2011
Transmissibility of BSE-L and Cattle-Adapted TME Prion Strain to Cynomolgus
Macaque
"BSE-L in North America may have existed for decades"
PLOS Singeltary Comment ;
*** ruminant feed ban for cervids in the United States ? ***
31 Jan 2015 at 20:14 GMT
Saturday, January 24, 2015
Bovine Spongiform Encephalopathy: Atypical Pros and Cons
Saturday, January 31, 2015
RAPID ADVICE 17-2014 : Evaluation of the risk for public health of casings
in countries with a “negligible risk status for BSE” and on the risk of
modification of the list of specified risk materials (SRM) with regard to BSE
Conclusion/Significance: Our results point to a possibly higher degree of
pathogenicity of BASE than classical BSE in primates and also raise a question
about a possible link to one uncommon subset of cases of apparently sporadic
CJD. Thus, despite the waning epidemic of classical BSE, the occurrence of
atypical strains should temper the urge to relax measures currently in place to
protect public health from accidental contamination by BSE-contaminated
products.
SPONTANEOUS TSE
Perspectives BIOMEDICINE: A Fresh Look at BSE Bruce Chesebro*
Mad cow disease, or bovine spongiform encephalopathy (BSE), is the cattle
form of a family of progressive brain diseases. These diseases include scrapie
in sheep, Creutzfeldt-Jakob disease (CJD) in humans, and chronic wasting disease
(CWD) in deer and elk. They are also known as either "prion diseases" because of
the association of a misfolded cellular prion protein in pathogenesis or
"transmissible spongiform encephalopathies" (TSEs) because of the spongelike
nature of the damaged brain tissue (1).
The recent discovery of two BSE-infected cows, one in Canada and one in the
United States, has dramatically increased concern in North America among meat
producers and consumers alike over the extent to which BSE poses a threat to
humans as well as to domestic and wild animals. The European BSE epidemic of the
late-1980s seems to have been initiated a decade earlier in the United Kingdom
by changes in the production of meat and bone meal (MBM) from rendered
livestock, which led to contamination of MBM with the BSE infectious agent.
Furthermore, the fact that UK farmers fed this rendered MBM to younger animals
and that this MBM was distributed to many countries may have contributed to the
ensuing BSE epidemic in the United Kingdom and internationally (2).
Despite extensive knowledge about the spread of BSE through contaminated
MBM, the source of BSE in Europe remains an unsolved mystery (2). It has been
proposed that BSE could be derived from a cross-species infection, perhaps
through contamination of MBM by scrapie-infected sheep tissues (see the figure).
Alternatively, BSE may have been an endemic disease in cattle that went
unnoticed because of its low level of horizontal transmission. Lastly, BSE might
have originated by "spontaneous" misfolding of the normal cellular prion protein
into the disease-associated abnormal isoform (3), which is postulated to be the
infectious agent or "prion."
Five possible sources of BSE in North American cattle. Sheep, deer, and elk
could spread prion diseases (TSEs) to cattle through direct animal contact or
contamination of pastures. Endemic BSE has not been proven to exist anywhere in
the world, but it is difficult to exclude this possibility because of the
inefficient spread of BSE infectivity between individual animals (2). BSE caused
by spontaneous misfolding of the prion protein has not been proven. CREDIT:
KATHARINE SUTLIFF/SCIENCE
snip...
Nevertheless, the idea that BSE might originate due to the spontaneous
misfolding of prion proteins has received renewed interest in the wake of
reports suggesting the occurrence of atypical BSE (9-11). These results imply
that new strains of cattle BSE might have originated separately from the main UK
outbreak. Where and how might such strains have originated? Although such rare
events cannot be studied directly, any number of sources of the original BSE
strain could also explain the discovery of additional BSE strains in cattle (see
the figure). However, it would be worrisome if spontaneous BSE were really a
valid etiology because such a mechanism would be impossible to prevent--unlike
other possible scenarios that could be controlled by large-scale eradication of
TSE-positive animals.
Another way to look at this problem is to examine evidence for possible
spontaneous TSE disease in other animals besides cattle. Spontaneous BSE would
be extremely difficult to detect in cattle, where horizontal spread is minimal.
However, in the case of the sheep TSE disease, scrapie, which spreads from ewes
to lambs at birth as well as between adults, spontaneous disease should be
detectable as new foci of clinical infection. In the early 1950s scrapie was
eradicated in both Australia and New Zealand, and the mainland of both these
countries has remained scrapie-free ever since. This scrapie-free status is not
the result of selection of sheep resistant to scrapie because sheep from New
Zealand are as susceptible as their UK counterparts to experimental scrapie
infection (12). These experiments of man and nature appear to indicate that
spontaneous clinical scrapie does not occur in sheep. Similarly, because CWD is
known to spread horizontally, the lack of CWD in the deer or elk of eastern
North America but its presence in western regions would also argue against a
spontaneous disease mechanism. This is particularly noteworthy in New Zealand,
where there are large numbers of deer and elk farms and yet no evidence of
spontaneous CWD. If spontaneous scrapie does not occur in sheep or deer, this
would suggest that spontaneous forms of BSE and sporadic Creutzfeldt-Jakob
disease (sCJD) are unlikely to be found in cattle or humans. The main caveat to
this notion is that spontaneous disease may arise in some animal species but not
others. In humans, sCJD--which is considered by some researchers to begin by
spontaneous misfolding of the prion protein--usually takes more than 50 years to
appear. Thus, in animals with a shorter life-span, such as sheep, deer, and
cattle, an analogous disease mechanism might not have time to develop.
What can we conclude so far about BSE in North America? Is the BSE detected
in two North American cows sporadic or spontaneous or both? "Sporadic" pertains
to the rarity of disease occurrence. "Spontaneous" pertains to a possible
mechanism of origin of the disease. These are not equivalent terms. The rarity
of BSE in North America qualifies it as a sporadic disease, but this low
incidence does not provide information about cause. For the two reported North
American BSE cases, exposure to contaminated MBM remains the most likely
culprit. However, other mechanisms are still possible, including cross-infection
by sheep with scrapie or cervids with CWD, horizontal transmission from cattle
with endemic BSE, and spontaneous disease in individual cattle. Based on our
understanding of other TSEs, the spontaneous mechanism is probably the least
likely. Thus, "idiopathic" BSE--that is, BSE of unknown etiology--might be a
better term to describe the origin of this malady. ...
snip...full text ;
DR. DEHAVEN: “All right. I think we've got three different questions in
there, and I'll try to touch on each one of them.
“First of all, let me correct just a technical issue, and that is you
mentioned 1 in 10,000. And actually our surveillance system currently is
designed, the one that we have in place now is designed to detect 1 positive in
1 million cattle, and I gave some numbers between 200,000 and 268,000 that would
allow us to detect 1 in 10 million as opposed to 1 in 10,000.
“So we would, if we were able to collect in the ballpark of those numbers
of samples then we with increasing numbers of samples have an increasingly
statistically valid sample from which to determine, one, whether or not the
disease exists and, if so, at what prevalence level.
“So our real emphasis is to test as many of those animals as we can, ensure
that we get an appropriate geographical distribution, but not setting a specific
number as far as a target. Again, consistent with the recommendation from the
International Review Team, their recommendation was to test all of them.
“So that's consistent with where we're going is to test as many as we
possibly can.
*** “As far as spontaneous cases, that is a very difficult issue. There is
no evidence to prove that spontaneous BSE occurs in cattle; but here again it's
an issue of proving a negative. We do know that CJD, the human version of the
disease, does occur spontaneously in humans at the rate of about 1 in 1 million.
We don't have enough data to definitively say that spontaneous cases of BSE in
cattle occur or do not occur.
“Again, it's a very difficult situation to prove a negative.
“So a lot of research is ongoing. Certainly if we do come up with any
positive samples in the course of this surveillance we will be looking at that
question in evaluating those samples but no scientifically hard evidence to
confirm or refute whether or not spontaneous cases of BSE occur.
snip...
http://www.usda.gov/wps/portal/!ut/p/_s.7_0_A/7_0_1OB?contentidonly=true&contentid=2004/03/0106.html
1. The BSE epidemic
1.1. The origin of the BSE epidemic will probably never be determined with
certainty.
1.2. We do not know whether or not some of the BARB cases represent truly
sporadic classical BSE. If there are spontaneous cases then BSE will never be
eradicated although reducing surveillance could make it appear that BSE has been
eradicated.
snip...
5.3. It was stated that the number of sporadic CJD cases was rising.
Participants were invited to discuss the reason for this. It was suggested that
this was likely to be due to improved surveillance with more cases of sporadic
CJD being detected (i.e. through MRI scans). There had been a similar increase
in sporadic CJD in countries which did not have a BSE epidemic but improved
their surveillance. This supported this theory and suggested that the increase
in sporadic CJD was not related to the BSE outbreak.
Atypical BSE: Transmissibility
Linda Detwiller, 5/10/2011
BASE (L) transmitted to: cattle (IC) - inc < 20 mos and oral?)
Cynomolgus macaques (IC)
Mouse lemurs (IC and oral)
wild-type mice (IC)
bovinized transgenic mice (IC and IP)
humanized transgenic mice (IC)
H cases transmitted to:
cattle – IC incubations < 20 months
bovinized transgenic mice (IC)
ovinized transgenic mice (IC)
C57BL mice (IC)
One study did not transmit to humanized PrP Met 129 mice
Evaluation of Possibility of Atypical
BSE Transmitting to Humans
Possble interpretation:
L type seems to transmit to nonhuman primates with greater ease than
classical BSE
L type also transmitted to humanized transgenic mice with higher attack
rate and shorter incubation period than classical?
H type did not transmit to Tg Hu transgenic mice
Linda Detwiller, 5/10/2011
I ask Professor Kong ;
Thursday, December 04, 2008 3:37 PM
Subject: RE: re--Chronic Wating Disease (CWD) and Bovine Spongiform
Encephalopathies (BSE): Public Health Risk Assessment
IS the h-BSE more virulent than typical BSE as well, or the same as cBSE,
or less virulent than cBSE? just curious.....
Professor Kong reply ;
.....snip
As to the H-BSE, we do not have sufficient data to say one way or another,
but we have found that H-BSE can infect humans. I hope we could publish these
data once the study is complete. Thanks for your interest.
Best regards, Qingzhong Kong, PhD Associate Professor Department of
Pathology Case Western Reserve University Cleveland, OH 44106 USA
BSE-H is also transmissible in our humanized Tg mice. The possibility of
more than two atypical BSE strains will be discussed.
Supported by NINDS NS052319, NIA AG14359, and NIH AI 77774.
P.4.23 Transmission of atypical BSE in humanized mouse models
Liuting Qing1, Wenquan Zou1, Cristina Casalone2, Martin Groschup3, Miroslaw
Polak4, Maria Caramelli2, Pierluigi Gambetti1, Juergen Richt5, Qingzhong Kong1
1Case Western Reserve University, USA; 2Instituto Zooprofilattico Sperimentale,
Italy; 3Friedrich-Loeffler-Institut, Germany; 4National Veterinary Research
Institute, Poland; 5Kansas State University (Previously at USDA National Animal
Disease Center), USA
Background: Classical BSE is a world-wide prion disease in cattle, and the
classical BSE strain (BSE-C) has led to over 200 cases of clinical human
infection (variant CJD). Atypical BSE cases have been discovered in three
continents since 2004; they include the L-type (also named BASE), the H-type,
and the first reported case of naturally occurring BSE with mutated bovine PRNP
(termed BSE-M). The public health risks posed by atypical BSE were argely
undefined.
Objectives: To investigate these atypical BSE types in terms of their
transmissibility and phenotypes in humanized mice.
Methods: Transgenic mice expressing human PrP were inoculated with several
classical (C-type) and atypical (L-, H-, or Mtype) BSE isolates, and the
transmission rate, incubation time, characteristics and distribution of PrPSc,
symptoms, and histopathology were or will be examined and compared.
Results: Sixty percent of BASE-inoculated humanized mice became infected
with minimal spongiosis and an average incubation time of 20-22 months, whereas
only one of the C-type BSE-inoculated mice developed prion disease after more
than 2 years. Protease-resistant PrPSc in BASE-infected humanized Tg mouse
brains was biochemically different from bovine BASE or sCJD. PrPSc was also
detected in the spleen of 22% of BASE-infected humanized mice, but not in those
infected with sCJD. Secondary transmission of BASE in the humanized mice led to
a small reduction in incubation time. The atypical BSE-H strain is also
transmissible with distinct phenotypes in the humanized mice, but no BSE-M
transmission has been observed so far.
Discussion: Our results demonstrate that BASE is more virulent than
classical BSE, has a lymphotropic phenotype, and displays a modest transmission
barrier in our humanized mice. BSE-H is also transmissible in our humanized Tg
mice. The possibility of more than two atypical BSE strains will be discussed.
Supported by NINDS NS052319, NIA AG14359, and NIH AI 77774.
14th International Congress on Infectious Diseases H-type and L-type
Atypical BSE January 2010 (special pre-congress edition)
18.173 page 189
Experimental Challenge of Cattle with H-type and L-type Atypical BSE
A. Buschmann1, U. Ziegler1, M. Keller1, R. Rogers2, B. Hills3, M.H.
Groschup1. 1Friedrich-Loeffler-Institut, Greifswald-Insel Riems, Germany,
2Health Canada, Bureau of Microbial Hazards, Health Products & Food Branch,
Ottawa, Canada, 3Health Canada, Transmissible Spongiform Encephalopathy
Secretariat, Ottawa, Canada
Background: After the detection of two novel BSE forms designated H-type
and L-type atypical BSE the question of the pathogenesis and the agent
distribution of these two types in cattle was fully open. From initial studies
of the brain pathology, it was already known that the anatomical distribution of
L-type BSE differs from that of the classical type where the obex region in the
brainstem always displays the highest PrPSc concentrations. In contrast in
L-type BSE cases, the thalamus and frontal cortex regions showed the highest
levels of the pathological prion protein, while the obex region was only weakly
involved.
Methods:We performed intracranial inoculations of cattle (five and six per
group) using 10%brainstemhomogenates of the two German H- and L-type atypical
BSE isolates. The animals were inoculated under narcosis and then kept in a
free-ranging stable under appropriate biosafety conditions. At least one animal
per group was killed and sectioned in the preclinical stage and the remaining
animals were kept until they developed clinical symptoms. The animals were
examined for behavioural changes every four weeks throughout the experiment
following a protocol that had been established during earlier BSE pathogenesis
studies with classical BSE.
Results and Discussion: All animals of both groups developed clinical
symptoms and had to be euthanized within 16 months. The clinical picture
differed from that of classical BSE, as the earliest signs of illness were loss
of body weight and depression. However, the animals later developed hind limb
ataxia and hyperesthesia predominantly and the head. Analysis of brain samples
from these animals confirmed the BSE infection and the atypical Western blot
profile was maintained in all animals. Samples from these animals are now being
examined in order to be able to describe the pathoge esis and agent distribution
for these novel BSE types.
Conclusions: A pilot study using a commercially avaialble BSE rapid test
ELISA revealed an essential restriction of PrPSc to the central nervous system
for both atypical BSE forms. A much more detailed analysis for PrPSc and
infectivity is still ongoing.
14th ICID International Scientific Exchange Brochure - Final Abstract
Number: ISE.114
Session: International Scientific Exchange
Transmissible Spongiform encephalopathy (TSE) animal and human TSE in North
America update October 2009
T. Singeltary Bacliff, TX, USA
Background: An update on atypical BSE and other TSE in North America.
Please remember, the typical U.K. c-BSE, the atypical l-BSE (BASE), and h-BSE
have all been documented in North America, along with the typical scrapie's, and
atypical Nor-98 Scrapie, and to date, 2 different strains of CWD, and also TME.
All these TSE in different species have been rendered and fed to food producing
animals for humans and animals in North America (TSE in cats and dogs ?), and
that the trading of these TSEs via animals and products via the USA and Canada
has been immense over the years, decades.
Methods: 12 years independent research of available data
Results: I propose that the current diagnostic criteria for human TSEs only
enhances and helps the spreading of human TSE from the continued belief of the
UKBSEnvCJD only theory in 2009. With all the science to date refuting it, to
continue to validate this old myth, will only spread this TSE agent through a
multitude of potential routes and sources i.e. consumption, medical i.e.,
surgical, blood, dental, endoscopy, optical, nutritional supplements, cosmetics
etc.
Conclusion: I would like to submit a review of past CJD surveillance in the
USA, and the urgent need to make all human TSE in the USA a reportable disease,
in every state, of every age group, and to make this mandatory immediately
without further delay. The ramifications of not doing so will only allow this
agent to spread further in the medical, dental, surgical arena's. Restricting
the reporting of CJD and or any human TSE is NOT scientific. Iatrogenic CJD
knows NO age group, TSE knows no boundaries. I propose as with Aguzzi, Asante,
Collinge, Caughey, Deslys, Dormont, Gibbs, Gajdusek, Ironside, Manuelidis,
Marsh, et al and many more, that the world of TSE Transmissible Spongiform
Encephalopathy is far from an exact science, but there is enough proven science
to date that this myth should be put to rest once and for all, and that we move
forward with a new classification for human and animal TSE that would properly
identify the infected species, the source species, and then the route.
Tuesday, December 16, 2014
Evidence for zoonotic potential of ovine scrapie prions
Hervé Cassard,1, n1 Juan-Maria Torres,2, n1 Caroline Lacroux,1, Jean-Yves
Douet,1, Sylvie L. Benestad,3, Frédéric Lantier,4, Séverine Lugan,1, Isabelle
Lantier,4, Pierrette Costes,1, Naima Aron,1, Fabienne Reine,5, Laetitia
Herzog,5, Juan-Carlos Espinosa,2, Vincent Beringue5, & Olivier Andréoletti1,
Affiliations Contributions Corresponding author Journal name: Nature
Communications Volume: 5, Article number: 5821 DOI: doi:10.1038/ncomms6821
Received 07 August 2014 Accepted 10 November 2014 Published 16 December 2014
Article tools Citation Reprints Rights & permissions Article metrics
Abstract
Although Bovine Spongiform Encephalopathy (BSE) is the cause of variant
Creutzfeldt Jakob disease (vCJD) in humans, the zoonotic potential of scrapie
prions remains unknown. Mice genetically engineered to overexpress the human
prion protein (tgHu) have emerged as highly relevant models for gauging the
capacity of prions to transmit to humans. These models can propagate human
prions without any apparent transmission barrier and have been used used to
confirm the zoonotic ability of BSE. Here we show that a panel of sheep scrapie
prions transmit to several tgHu mice models with an efficiency comparable to
that of cattle BSE. The serial transmission of different scrapie isolates in
these mice led to the propagation of prions that are phenotypically identical to
those causing sporadic CJD (sCJD) in humans. These results demonstrate that
scrapie prions have a zoonotic potential and raise new questions about the
possible link between animal and human prions.
Subject terms: Biological sciences• Medical research At a glance
why do we not want to do TSE transmission studies on chimpanzees $
5. A positive result from a chimpanzee challenged severly would likely
create alarm in some circles even if the result could not be interpreted for
man. I have a view that all these agents could be transmitted provided a large
enough dose by appropriate routes was given and the animals kept long enough.
Until the mechanisms of the species barrier are more clearly understood it might
be best to retain that hypothesis.
snip...
R. BRADLEY
Friday, January 30, 2015
Scrapie: a particularly persistent pathogen
Transmissible Mink Encephalopathy TME PRION DISEASE
Article
Evaluation of the Zoonotic Potential of Transmissible Mink
Encephalopathy
Emmanuel E. Comoy 1,*, Jacqueline Mikol 1, Marie-Madeleine Ruchoux 1,
Valérie Durand 1, Sophie Luccantoni-Freire 1, Capucine Dehen 1, Evelyne Correia
1, Cristina Casalone 2, Juergen A. Richt 3, Justin J. Greenlee 4, Juan Maria
Torres 5, Paul Brown 1 and Jean-Philippe Deslys 1
1 CEA, Institute of Emerging Diseases and Innovative Therapies (iMETI),
Division of Prions and Related Diseases (SEPIA), Route du Panorama, BP6, 92265
Fontenay-aux-Roses, France; E-Mails: jacqueline.mikol@wanadoo.fr (J.M.);
mruchoux@yahoo.fr (M.-M.R.); valerie.durand@cea.fr (V.D.);
sophie.luccantoni@cea.fr (S.L.); capucine.dehen@cea.fr (C.D.);
evelyne.correia@cea.fr (E.C.); paulwbrown@comcast.net (P.B.); jpdeslys@cea.fr
(J-P.D.)
2 Istituto Zooprofilattico Sperimentale del Piemonte, Via Bologna 148,
10154 Torino, Italy; E-Mail: cristina.casalone@izsto.it (C.C.)
3 Kansas State University, College of Veterinary Medicine, K224B Mosier
Hall, Manhattan, Kansas 66506-5601 USA; E-Mail: jricht@vet.k-state.edu
4 National Animal Disease Center, USDA, Agricultural Research Service, 1920
Dayton Ave, Ames, Iowa 50010 USA; E-Mail: justin.greenlee@ars.usda.gov
(J.J.G.)
5 Instituto Nacional de Investigacion y Tecnologia Agraria y Alimentaria,
Madrid, Spain; E-mail: jmtorres@inia.es
* Author to whom correspondence should be addressed; E-Mail:
emmanuel.comoy@cea.fr (E.E.C.); Tel.: +33-46-54-90-05; Fax: +33-46-54-93-19.
Received: 27 June 2013; in revised form: 28 July 2013 / Accepted: 30 July 2013 /
Published: 30 July 2013
Abstract: Successful transmission of Transmissible Mink Encephalopathy
(TME) to cattle supports the bovine hypothesis for the still controversial
origin of TME outbreaks. Human and primate susceptibility to classical Bovine
Spongiform Encephalopathy (c-BSE) and the transmissibility of L-type BSE to
macaques indicate a low cattle-to-primate species barrier. We therefore
evaluated the zoonotic potential of cattle-adapted TME. In less than two years,
this strain induced in cynomolgus macaques a neurological disease similar to
L-BSE but distinct from c-BSE. TME derived from another donor species (raccoon)
induced a similar disease with even shorter incubation periods. L-BSE and
cattle-adapted TME were also transmissible to transgenic mice expressing human
prion protein (PrP). Secondary transmissions to transgenic mice expressing
bovine PrP maintained the features of the three tested bovine strains (cattle
TME, c-BSE and L-BSE) regardless of intermediate host. Thus, TME is the third
animal prion strain transmissible to both macaques and humanized transgenic
mice, suggesting zoonotic potentials that should be considered in the risk
analysis of animal prion diseases for human health. Moreover, the similarities
between TME and L-BSE are highly suggestive of a link between these strains, and
therefore the possible presence of L-BSE for many decades prior to its
identification in USA and Europe.
Keywords: primate; prion; transgenic mice; TME; cattle; raccoon; zoonotic
potential
SNIP...
4. Conclusions We have shown that cattle-adapted TME is the third cattle
prion strain (joining classical and L-type BSE) to be transmissible both to
non-human primates and transgenic mice overexpressing human PrP. However, the
successful transmission of raccoon TME to primate, inducing a disease with
similar features as cattle TME, extends this notion to TME-related strains
independent of host origin. Pathological, biochemical and bioassay
investigations converged to demonstrate the similarity between cattle-adapted
TME and L-BSE. Together with previous experiments performed in ovinized and
bovinized transgenic mice and hamsters [8,9] indicating similarities between TME
and L-BSE, the data support the hypothesis that L-BSE could be the origin of the
TME outbreaks in North America and Europe during the mid-1900s. The corollary of
this notion is the longstanding existence of atypical bovine prion cases in
those countries during the same period, if not earlier. Although the risk of
L-BSE for public health must be further assessed through studies using the oral
route of exposure before drawing definitive conclusions, these data underline
the importance of a potential zoonotic risk of L-BSE in the management of
consumer protection, particularly in the context of the current relaxation of
European policy with respect to BSE.
Evidence That Transmissible Mink Encephalopathy Results from Feeding
Infected Cattle Over the next 8-10 weeks, approximately 40% of all the adult
mink on the farm died from TME.
snip...
The rancher was a ''dead stock'' feeder using mostly (>95%) downer or
dead dairy cattle...
Sunday, December 10, 2006
Transmissible Mink Encephalopathy TME
Saturday, December 01, 2007
Phenotypic Similarity of Transmissible Mink Encephalopathy in Cattle and
L-type Bovine Spongiform Encephalopathy in a Mouse Model
Tuesday, July 21, 2009
Transmissible mink encephalopathy - review of the etiology
http://transmissible-mink-encephalopathy.blogspot.com/2009/07/transmissible-mink-encephalopathy.html
Comment from Terry Singeltary This is a Comment on the Food and Drug
Administration (FDA) Notice: Draft Guidance for Industry on Ensuring Safety of
Animal Feed Maintained and Fed On-Farm; Availability
For related information, Open Docket Folder Docket folder icon
--------------------------------------------------------------------------------
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Comment View document:
Guidance for Industry Ensuring Safety of Animal Feed Maintained and Fed
On-Farm Draft Guidance FDA-2014-D-1180 Singeltary Comment
Greetings FDA et al,
I wish to comment on Guidance for Industry Ensuring Safety of Animal Feed
Maintained and Fed On-Farm Draft Guidance FDA-2014-D-1180.
Once again, I wish to kindly bring up the failed attempt of the FDA and the
ruminant to ruminant mad cow feed ban of August 4, 1997. This feed ban is still
failing today, as we speak. Even more worrisome, is the fact it is still legal
to feed cervids to cervids in the USA, in fact, the FDA only _recommends_ that
deer and elk considered to be of _high_ risk for CWD do not enter the animal
food chain, but there is NO law, its only voluntary, a recipe for a TSE prion
disaster, as we have seen with the ruminant to ruminant feed ban for cattle,
where in 2007, one decade post August 1997 mad cow feed ban, where in 2007
10,000,000 POUNDS OF BANNED BLOOD LACED MEAT AND BONE MEAL WHEN OUT INTO
COMMERCE, TO BE FED OUT. Since 2007, these BSE feed ban rules have been breached
time and time again. tons and tons of mad cow feed went out in Alabama as well,
where one of the mad cows were documented, just the year before in 2006, and in
2013 and 2014, breaches so bad (OAI) Official Action Indicated were issued.
those are like the one issued where 10 million pounds of banned blood laced meat
and bone meal were fed out.
What is the use of having a Guidance for Industry Ensuring Safety of Animal
Feed Maintained and Fed On-Farm Draft Guidance FDA-2014-D-1180, if it cannot be
enforced, as we have seen with a mandatory ruminant to ruminant feed ban?
I strenuously once again urge the FDA and its industry constituents, to
make it MANDATORY that all ruminant feed be banned to all ruminants, and this
should include all cervids as soon as possible for the following
reasons...
======
In the USA, under the Food and Drug Administrations BSE Feed Regulation (21
CFR 589.2000) most material (exceptions include milk, tallow, and gelatin) from
deer and elk is prohibited for use in feed for ruminant animals. With regards to
feed for non-ruminant animals, under FDA law, CWD positive deer may not be used
for any animal feed or feed ingredients. For elk and deer considered at high
risk for CWD, the FDA recommends that these animals do not enter the animal feed
system.
***However, this recommendation is guidance and not a requirement by law.
======
31 Jan 2015 at 20:14 GMT
*** Ruminant feed ban for cervids in the United States? ***
31 Jan 2015 at 20:14 GMT
19 May 2010 at 21:21 GMT
*** Singeltary reply ; Molecular, Biochemical and Genetic Characteristics
of BSE in Canada Singeltary reply ;
Tuesday, December 23, 2014
FDA PART 589 -- SUBSTANCES PROHIBITED FROM USE IN ANIMAL FOOD OR FEED
VIOLATIONS OFFICIAL ACTION INDICATED OAI UPDATE DECEMBER 2014 BSE TSE PRION
2013
Sunday, December 15, 2013
FDA PART 589 -- SUBSTANCES PROHIBITED FROM USE IN ANIMAL FOOD OR FEED
VIOLATIONS OFFICIAL ACTION INDICATED OAI UPDATE DECEMBER 2013 UPDATE
DOCKET-- 03D-0186 -- FDA Issues Draft Guidance on Use of Material From Deer
and Elk in Animal Feed; Availability
Date: Fri, 16 May 2003 11:47:37 0500
EMC 1 Terry S. Singeltary Sr. Vol #: 1
PLEASE SEE FULL TEXT SUBMISSION ;
10,000,000+ LBS. of PROHIBITED BANNED MAD COW FEED I.E. BLOOD LACED MBM IN
COMMERCE USA 2007
Date: March 21, 2007 at 2:27 pm PST
REASON
Blood meal used to make cattle feed was recalled because it was cross-
contaminated with prohibited bovine meat and bone meal that had been
manufactured on common equipment and labeling did not bear cautionary BSE
statement.
VOLUME OF PRODUCT IN COMMERCE
42,090 lbs.
DISTRIBUTION
WI
REASON
Products manufactured from bulk feed containing blood meal that was cross
contaminated with prohibited meat and bone meal and the labeling did not bear
cautionary BSE statement.
VOLUME OF PRODUCT IN COMMERCE
9,997,976 lbs.
DISTRIBUTION
ID and NV
END OF ENFORCEMENT REPORT FOR MARCH 21, 2007
Terry S. Singeltary Sr.
*** See attached file(s) No documents available. Attachments View All (1)
Guidance for Industry Ensuring Safety of Animal Feed Maintained and Fed On-Farm
Terry Singeltary Comment View Attachment:
Sunday, April 5, 2015
*** Guidance for Industry Ensuring Safety of Animal Feed Maintained and Fed
On-Farm Draft Guidance FDA-2014-D-1180 ***
Tuesday, February 17, 2015
Could we spot the next BSE?, asks BVA President
CHRONIC WASTING DISEASE CWD TSE PRION
Tuesday, December 20, 2011
CHRONIC WASTING DISEASE CWD WISCONSIN Almond Deer (Buckhorn Flats)
Farm
Update DECEMBER 2011The CWD infection rate was nearly 80%, the highest ever
in a North American captive herd. RECOMMENDATION: That the Board approve the
purchase of 80acres of land for $465,000 for the Statewide Wildlife Habitat
Program inPortage County and approve the restrictions on public use of the
site.SUMMARY:
IOWA TEST RESULTS FROM CAPTIVE DEER HERD WITH CHRONIC WASTING DISEASE
RELEASED 79.8 percent of the deer tested positive for the disease
For Immediate Release
Thursday, October 2, 2014
Dustin Vande Hoef 515/281-3375 or 515/326-1616 (cell) or
Dustin.VandeHoef@IowaAgriculture.gov Share on facebook Share on twitter Share on
email Share on print More Sharing Services 1
TEST RESULTS FROM CAPTIVE DEER HERD WITH CHRONIC WASTING DISEASE RELEASED
79.8 percent of the deer tested positive for the disease
DES MOINES – The Iowa Department of Agriculture and Land Stewardship today
announced that the test results from the depopulation of a quarantined captive
deer herd in north-central Iowa showed that 284 of the 356 deer, or 79.8% of the
herd, tested positive for Chronic Wasting Disease (CWD). The owners of the
quarantined herd have entered into a fence maintenance agreement with the Iowa
Department of Agriculture and Land Stewardship, which requires the owners to
maintain the 8’ foot perimeter fence around the herd premises for five years
after the depopulation was complete and the premises had been cleaned and
disinfected
CWD is a progressive, fatal, degenerative neurological disease of farmed
and free-ranging deer, elk, and moose. There is no known treatment or vaccine
for CWD. CWD is not a disease that affects humans.
On July 18, 2012, USDA Animal and Plant Health Inspection Service’s (APHIS)
National Veterinary Services Lab in Ames, IA confirmed that a male white tail
deer harvested from a hunting preserve in southeast IA was positive for CWD. An
investigation revealed that this animal had just been introduced into the
hunting preserve from the above-referenced captive deer herd in north-central
Iowa.
The captive deer herd was immediately quarantined to prevent the spread of
CWD. The herd has remained in quarantine until its depopulation on August 25 to
27, 2014.
The Iowa Department of Agriculture and Land Stewardship participated in a
joint operation to depopulate the infected herd with USDA Veterinary Services,
which was the lead agency, and USDA Wildlife Services.
Federal indemnity funding became available in 2014. USDA APHIS appraised
the captive deer herd of 376 animals at that time, which was before depopulation
and testing, at $1,354,250. At that time a herd plan was developed with the
owners and officials from USDA and the Iowa Department of Agriculture and Land
Stewardship.
Once the depopulation was complete and the premises had been cleaned and
disinfected, indemnity of $917,100.00 from the USDA has been or will be paid to
the owners as compensation for the 356 captive deer depopulated.
The Iowa Department of Agriculture and Land Stewardship operates a
voluntary CWD program for farms that sell live animals. Currently 145 Iowa farms
participate in the voluntary program. The above-referenced captive deer facility
left the voluntary CWD program prior to the discovery of the disease as they had
stopped selling live animals. All deer harvested in a hunting preserve must be
tested for CWD.
-30-
*** see history of this CWD blunder here ;
On June 5, 2013, DNR conducted a fence inspection, after gaining approval
from surrounding landowners, and confirmed that the fenced had beencut or
removed in at least four separate locations; that the fence had degraded and was
failing to maintain the enclosure around the Quarantined Premises in at least
one area; that at least three gates had been opened;and that deer tracks were
visible in and around one of the open areas in the sand on both sides of the
fence, evidencing movement of deer into the Quarantined Premises.
Tuesday, January 06, 2015
APHIS Provides Additional Information on Chronic Wasting Disease (CWD)
Indemnity Requests January 5, 2015 05:26 PM EST
Thursday, April 02, 2015
OHIO CONFIRMS SECOND POSTIVE CHRONIC WASTING DISEASE CWD on Yoder's
properties near Millersburg
Wednesday, March 18, 2015
Chronic Wasting Disease CWD Confirmed Texas Trans Pecos March 18,
2015
Wednesday, March 25, 2015
Chronic Wasting Disease CWD Cases Confirmed In New Mexico 2013 and 2014
UPDATE 2015
Sunday, December 28, 2014
CHRONIC WASTING DISEASE CWD TSE PRION DISEASE AKA MAD DEER DISIEASE
USDAUSAHA INC DECEMBER 28, 2014
Thursday, March 20, 2014
CHRONIC WASTING DISEASE CWD TSE PRION OF CERVID AND THE POTENTIAL FOR HUMAN
TRANSMISSION THEREFROM 2014
Tuesday, July 01, 2014
*** CHRONIC WASTING DISEASE CWD TSE PRION DISEASE, GAME FARMS, AND
POTENTIAL RISK FACTORS THERE FROM ***
Thursday, July 03, 2014
*** How Chronic Wasting Disease is affecting deer population and what’s the
risk to humans and pets? ***
Thursday
CWD TO HUMANS, AND RISK FACTORS THERE FROM (see latest science)
Tuesday, November 04, 2014
*** Six-year follow-up of a point-source exposure to CWD contaminated
venison in an Upstate New York community: risk behaviours and health outcomes
2005–2011
KURU
another interesting aspect of the TSE prion disease is KURU ;
Figure 25. All cooking. including that of human flesh from diseased
kinsmen. was done in pits with steam made by pouring water over the hot stones,
or cooked in bamboo cylinders in the hot ashes. Children participated in both
the butchery and the handling of cooked meat, rubbing their soiled hands in
their armpits or hair, and elsewhere on their bodies. They rarely or never
washed. Infection with the kuru virus was most probably through the cuts and
abrasions of the skin. or from nose-picking, rye (eye...tss) rubbing, or mucosal
injury.
These detailed descriptions will be published elsewhere but have reaffirmed
the oral histories of endocannibalism in the Fore recorded previously12,22–24
and that this practice ceased abruptly at the time of Australian administrative
control over the kuru areas. Although isolated events might have occurred for a
few years after this prohibition, we are confident that new exposures of
individuals to kuru at mortuary feasts would not have occurred after 1960. Not
only have no cases of kuru been recorded in people born after 1959 (and only
nine were recorded in those born after 1956); but also all the 11 last recorded
cases of kuru that we report here were born before 1950. If any source of
infection remained, whether from surreptitious cannibalism, possible ground
contam-ination with human prions at sites where food was prepared, or other
lateral routes, we would expect individuals born after this period to have
kuru—especially since children are thought to have had shorter incubation
periods than adults. However, no such cases have been observed. Additionally,
although a fraction of hamster-adapted scrapie prions have been shown to survive
in soil for at least 3 years,25 the mortuary feast practices (during which the
entire body would be consumed) were undertaken so that any substantial
contamination of soil would not have occurred, and traditional bamboo knives and
leaf plates were burned after the feast. Furthermore, no clusters of kuru cases,
as seen earlier in the epidemic,26 have been recorded for many years....
Kuru: The Science and the Sorcery
Special Jury Prize Winner, Pacific International Documentary Film Festival
2011.
This is the true story of one of the most incredible and challenging
medical detective stories of the 20th Century; a history of human tragedy,
adventure and discovery. It is the story of the Fore, a Papuan community
immersed in cannibalistic mortuary practices and sorcery in one of the most
remote regions on the planet, and the tragic disease that threatened to wipe out
their entire population.
In 1961, a young Australian medical researcher, Michael Alpers, puts up his
hand to work on a new and strange disease in the Eastern Highlands of Papua New
Guinea. There, he teams up with an American outer, Dr Carleton Gajdusek, who has
been in the local Fore region since 1957. For Michael it is the beginning of a
lifelong obsession.
Together, they are amidst a major epidemic. It is killing over 200 people a
year with devastating effects. It mainly targets women and children. The local
people, the Fore, call the disease kuru, their word for shivering. They believe
it is caused by sorcery.
Michael and Carleton are baffled by the disease. There are no scientific
disciplines to guide them as they attempt to unravel its mysteries. By pure
chance, a link is made to a strange transmissible animal disease in sheep,
Scrapie. The two kuru researchers embark on a 10-year experiment to see if the
fatal degenerative brain disease in humans could be transmissible like
Scrapie.
The decision is made to perform an autopsy on a kuru victim and inoculate
the kuru material into a chimpanzee. Kigea, ayoung girl in the village is
identified as being in the early stages of kuru. Kigea’s family, gives Michael
permission to perform an autopsy upon her death.
A brain sample taken from Kigea after her death is flown to the USA and
injected into a chimpanzee called Daisy. While Michael follows the progress of
the transmission experiment, he starts to collate all the recorded data on kuru
and begins to suspect cannibalism as the cause of the spreadof the
disease.
Within two years, he diagnoses Daisy with kuru. This is a defining moment.
It confirms kuru is transmissible and can cross the species barrier. The
revelation, together with epidemiological data collated with anthropologist
Shirley Lindenbaum, links the Fore’s mortuary feasts (consumption of dead
relatives) to the transmission of kuru. Cannibalism is the cause, and its origin
is linked to a rare disease called Creutzfeldt Jakob Disease(CJD), but the story
of kuru is far from over.
The infecting agent is the first new pathogen – prions – to be discovered
in over 100 years. Research results in two Nobel prizes: it’s discoveries
turning scientific understanding upside down, causing rifts in the beliefs ofthe
science community.
Then Mad Cow Disease (Bovine Spongiform Encephalopathy or BSE) reared its
head in the mid 1980s, and 10 years later the human variant CJD. All eyes turned
to kuru, the only model of a prion epidemic in human populations. Many unknowns
still surround prion diseases: there is no cure for kuru, or any of the prion
diseases. The effects are devastating and unprecedented incubation periods can
extend beyond 50 years.
Michael is the key and heart to this story, providing unique access to the
Fore people, and the world’s other leading authorities on the matter; including
Americans Prof. DC Gajdusek (Nobel Prize 1976), Prof. Stan Prusiner (Nobel Prize
1997), Prof Shirley Lindenbaum (Anthropologist) and British Prof. John Collinge
(Director, MRC Prion Unit, UK).
Kuru: The Science and the Sorcery combines history, science and
anthropology to tell a unique and ongoing ‘history of science’ documentary
spanning five decades. It intertwines the thinking of great minds, locally and
internationally, to reveal how this rare disease in the remote highlands of PNG
exploded to international attention and how Prion research has now revealed we
are all descendants of a remote past of cannibal practices.
Kuru: The Science and the Sorcery Australian scientist Michael Alpers
dedicated over 50 years to researching Kuru, an obscure and incurable brain
disease unique to the Fore people of New Guinea. Kuru was once thought to be a
psychosomatic illness, an infection, a genetic disorder, even a sorcerer's
curse, but Alpers' findings pointed to cannibalism as the culprit. Yet a recent
discovery has proven to be even more disturbing: the malady is linked to mad cow
disease and its human equivalent, variant CJD. With a decades-long incubation
period, could a larger outbreak be on its way?
human flesh taste very sweet
KURU EPIDEMIOLOGICAL PATROLS
Michael Alpers
First Reports
People of the Kuru region part 1
boy playing with animal bladder, blowing it up like a balloon. ...
People of the Kuru region part 2
Saturday, March 21, 2015
Canada and United States Creutzfeldt Jakob TSE Prion Disease Incidence
Rates Increasing
*** HUMAN MAD COW DISEASE nvCJD TEXAS CASE NOT LINKED TO EUROPEAN TRAVEL
CDC ***
Sunday, November 23, 2014
*** Confirmed Variant Creutzfeldt-Jakob Disease (variant CJD) Case in Texas
in June 2014 confirmed as USA case NOT European
the patient had resided in Kuwait, Russia and Lebanon. The completed
investigation did not support the patient's having had extended travel to
European countries, including the United Kingdom, or travel to Saudi Arabia. The
specific overseas country where this patient’s infection occurred is less clear
largely because the investigation did not definitely link him to a country where
other known vCJD cases likely had been infected.
Sunday, December 14, 2014
*** ALERT new variant Creutzfeldt Jakob Disease nvCJD or vCJD, sporadic CJD
strains, TSE prion aka Mad Cow Disease United States of America Update December
14, 2014 Report
Wednesday, January 28, 2015
Another new prion disease: relationship with central and peripheral
amyloidoses here we go again...
Thursday, January 15, 2015
41-year-old Navy Commander with sporadic Creutzfeldt–Jakob disease CJD TSE
Prion: Case Report
Subject: *** Becky Lockhart 46, Utah’s first female House speaker, dies
diagnosed with the extremely rare Creutzfeldt-Jakob disease aka mad cow type
disease
what is CJD ? just ask USDA inc., and the OIE, they are still feeding the
public and the media industry fed junk science that is 30 years old.
why doesn’t some of you try reading the facts, instead of rubber stamping
everything the USDA inc says.
sporadic CJD has now been linked to BSE aka mad cow disease, Scrapie, and
there is much concern now for CWD and risk factor for humans.
My sincere condolences to the family and friends of the House Speaker Becky
Lockhart. I am deeply saddened hear this.
with that said, with great respect, I must ask each and every one of you
Politicians that are so deeply saddened to hear of this needless death of the
Honorable House Speaker Becky Lockhart, really, cry me a friggen river. I am
seriously going to ask you all this...I have been diplomatic for about 17 years
and it has got no where. people are still dying. so, are you all stupid or
what??? how many more need to die ??? how much is global trade of beef and other
meat products that are not tested for the TSE prion disease, how much and how
many bodies is this market worth?
Saturday, January 17, 2015
*** Becky Lockhart 46, Utah’s first female House speaker, dies diagnosed
with the extremely rare Creutzfeldt-Jakob disease
Thursday, January 22, 2015
Transmission properties of atypical Creutzfeldt-Jakob disease: a clue to
disease etiology?
Tuesday, December 30, 2014
TSEAC USA Reason For Recalls Blood products, collected from a donors
considered to be at increased risk for Creutzfeldt-Jakob Disease (CJD), were
distributed END OF YEAR REPORT 2014
Saturday, April 11, 2015
ISU veterinary researchers study retinal scans as early detection method
for mad cow disease
who’s kidding whom $$$ i.e. USDA INC AND THE OIE
Wednesday, March 11, 2015
OIE and Centers for Disease Control and Prevention Reinforce Collaboration
2014
***Moreover, L-BSE has been transmitted more easily to transgenic mice
overexpressing a human PrP [13,14] or to primates [15,16] than C-BSE.
***It has been suggested that some sporadic CJD subtypes in humans may
result from an exposure to the L-BSE agent.
*** Lending support to this hypothesis, pathological and biochemical
similarities have been observed between L-BSE and an sCJD subtype (MV genotype
at codon 129 of PRNP) [17], and between L-BSE infected non-human primate and
another sCJD subtype (MM genotype) [15].
snip...
Monday, October 10, 2011
EFSA Journal 2011 The European Response to BSE: A Success Story
snip...
EFSA and the European Centre for Disease Prevention and Control (ECDC)
recently delivered a scientific opinion on any possible epidemiological or
molecular association between TSEs in animals and humans (EFSA Panel on
Biological Hazards (BIOHAZ) and ECDC, 2011). This opinion confirmed Classical
BSE prions as the only TSE agents demonstrated to be zoonotic so far
*** but the possibility that a small proportion of human cases so far
classified as "sporadic" CJD are of zoonotic origin could not be excluded.
*** Moreover, transmission experiments to non-human primates suggest that
some TSE agents in addition to Classical BSE prions in cattle (namely L-type
Atypical BSE, Classical BSE in sheep, transmissible mink encephalopathy (TME)
and chronic wasting disease (CWD) agents) might have zoonotic potential.
snip...
Thursday, August 12, 2010
Seven main threats for the future linked to prions
First threat
The TSE road map defining the evolution of European policy for protection
against prion diseases is based on a certain numbers of hypotheses some of which
may turn out to be erroneous. In particular, a form of BSE (called atypical
Bovine Spongiform Encephalopathy), recently identified by systematic testing in
aged cattle without clinical signs, may be the origin of classical BSE and thus
potentially constitute a reservoir, which may be impossible to eradicate if a
sporadic origin is confirmed.
*** Also, a link is suspected between atypical BSE and some apparently
sporadic cases of Creutzfeldt-Jakob disease in humans.
*** These atypical BSE cases constitute an unforeseen first threat that
could sharply modify the European approach to prion diseases.
Second threat
snip...
Saturday, December 13, 2014
Terry S. Singeltary Sr. Publications TSE prion disease
Diagnosis and Reporting of Creutzfeldt-Jakob Disease
Singeltary, Sr et al. JAMA.2001; 285: 733-734. Vol. 285 No. 6, February 14,
2001 JAMA
snip...
Terry S. Singeltary Sr. Bacliff, Texas USA 77518
flounder9@verizon.net
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