Quick facts about mad cow disease
Posted: Jan 20, 2012 12:32 PM ET
Last Updated: Jan 20, 2012 12:36 PM ET
Mad cow disease is the common name for a condition known technically as bovine spongiform encephalopathy, or BSE. Here are some quick facts about BSE, and its human offshoot, variant Creutzfeldt-Jakob disease.
What is BSE?
BSE is one of a group of brain and nervous-system diseases affecting various animals, such as chronic wasting disease in elk and deer in North America and scrapie in sheep. It's caused not by bacteria or viruses, but by rogue proteins called prions. The disease affects the brain and the spinal cord tissues. BSE gets its scientific name from the microscopic holes in the brains of affected animals, giving the tissue a sponge-like appearance. There is no vaccine or treatment for BSE, according to the World Organization for Animal Health.
How is BSE spread?
The only known source of mad cow disease is from animal-based feed contaminated with tissue from a diseased animal. The original source of BSE is believed to have been feed containing tainted meat from sheep with a related disease called scrapie. The disease gets into the human food supply when an infected cow is slaughtered for meat. Milk from infected cows doesn't spread the disease, according to the Canadian Food Inspection Agency.
Can it affect humans?
Yes. A prion disease called variant Creutzfeldt-Jakob disease (vCJD) was first diagnosed in humans in the United Kingdom in 1996 and has been linked to consumption of tissue from animals infected with BSE, according to the U.S. Centers for Disease Control and Prevention (CDC). The first person to develop symptoms of what turned out to be vCJD became ill in January 1994, according to the World Health Organization. Scientific evidence indicates that vCJD is caused by the same agent that causes BSE in cattle, says the Canadian Food Inspection Agency. The CDC adds that research indicates that older adults are much less susceptible to vCJD than children and young adults. Symptoms typically don't start showing up until several years after infection, sometimes taking nearly a decade to appear. Once someone is infected, there is no cure. Early in the illness, patients usually experience psychiatric symptoms, which most commonly take the form of depression or a schizophrenia-like psychosis, according to WHO. Unusual sensory symptoms, such as "stickiness" of the skin, have been experienced by half of the cases early in the illness. Neurological signs, including unsteadiness, difficulty walking and involuntary movements, develop as the illness progresses and, by the time of death, patients become completely immobile and mute.
What are my chances of getting infected?
Cows are shown on a farmer's field in High River, Alta., on May 22, 2003, two days after the Canadian Food Inspection Agency and the Alberta government announced a cow from a herd in northwestern Alberta was infected with BSE, the first case of mad cow disease reported in Canada in a decade.Adrian Wyld/Canadian Press
In Canada, brain and spinal cord material are removed from the carcass of animals and do not end up in the food supply. No cases of vCJD have been linked to eating Canadian beef, according to the Canadian Food Inspection Agency, and it says "the risk of contracting vCJD in Canada is extremely small." By October 2010, a total of 222 definite and probable variant CJD cases had been reported worldwide in residents of 12 countries, according to the Creutzfeldt-Jakob Disease Surveillance Network. Canada's first case was identified in 2002 and a second case was identified in March 2011, according to the Public Health Agency of Canada. Both were thought to have been contracted abroad.
How do I avoid it?
Cooking doesn't break down prions. The best way to avoid BSE is to not eat products that contain animal brain or spinal cord tissue.
What's a prion?
It's a self-replicating infection agent made of protein that can replicate like a virus. The word prion comes from "proteinaceous infectious particle," according to Scientific American, and it's an infectious agent that consists only of protein with no nucleic acid genome. (All previously known pathogens, such as bacteria and viruses, contain nucleic acids that enable them to reproduce.) Mad cow disease starts when prions mutate and trigger a chain reaction, which eventually kills the original cell and then moves on to other cells. Then the process begins all over again. Holes form in the infected brain as cells die, crippling the affected animal and finally killing it. Mutated prions are very hard to destroy because they don't break down under regular cooking temperatures as bacteria and viruses do.
What are the symptoms of BSE?
The problem for veterinarians is that animals with BSE can take four or five years to show signs of the disease. The symptoms also cover a wide range, including nervous or aggressive behaviour, depression, twitching, touch, hypersensitivity to sound and touch, strange postures, loss of co-ordination, difficulty standing up and weight loss, according to the World Organization for Animal Health.
How is it detected?
Tests for BSE are essentially a hunt for the presence of infectious prions. These tests are done on brain and spinal tissue of dead animals where prions are most highly concentrated. Clinical symptoms may raise suspicion that an animal has BSE, but a diagnosis can only be confirmed by microscopic examination of brain tissues taken on the dead animal, says the World Organization for Animal Health.
Has BSE been found in Canada?
Yes. In the most recent case, the Canadian Food Inspection Agency (CFIA) confirmed on Feb. 18, 2011, that it had detected a BSE case in a dairy cow born in Alberta in 2004. It reported that no part of the affected animal carcass entered the human food or animal feed systems. The first case of BSE in a Canadian-born beef cow was in May 2003. BSE is thought to have found its way into Canadian cattle in the 1980s or early 1990s through meat and bone meal that was ground up into a protein supplement for animal feed, according to the Canadian Food Inspection Agency. Canada's first known case of BSE was on a farm near Red Deer, Alta., in 1993 in a cow imported from Britain. Two other cows imported at the same time died and were processed into feed and food. Since 1997, it has been illegal in Canada to feed this type of cattle-based meal back to cattle. The CFIA introduced enhancements to the feed ban in July 2007, and tissue considered risky is now banned from all animal feeds, pet foods and fertilizers.
How prevalent is BSE today?
According to the U.S. Centers for Disease Control, BSE surveillance since 2003 has identified three BSE cases in the U.S. and 19 in Canada. Since March 2006, each of the 15 cattle reported with BSE in North America were born in Canada and identified through the Canadian BSE surveillance system. There was one reported case a year in Canada in 2009, 2010 and 2011. In Britain, the epicentre of the outbreak, there were 184,500 confirmed cases of BSE between 1993 and 2010. The numbers have been dropping, from 1,443 in 2000, to 225 in 2005, and 11 cases in 2010.
When was BSE first identified?
Mad cow disease began in England in 1984 when a cow developed strange symptoms and soon died. More unexplained deaths followed, and scientists began chasing down clues. It took two years, but in November 1986 the British made their first diagnosis of bovine spongiform encephalopathy. Almost five million cattle were slaughtered to stop the spread of BSE, but not before almost one million had made it into the food supply.
NOW, for the rest of the story...
seems this is the typical Governmental spoon fed BSe that most media still use, outdated, and prehistoric science. that’s why were are still in this mess.
sporadic CJD has now been linked to atypical L-BSE and atypical Scrapie.
sporadic CJD has mutated again, and is rising.
L-BSE is more virulent than the typical c-BSE, with an incubation period some 50% shorter.
BOTH atypical L-BSE and atypical Scrapie are documented in North America. why not print that?
CWD in deer and elk spreading, with a second strain emerging. scientist are now very concerned about the potential for CWD to be zoonotic.
why does the media refuse to print this?
why do they not produce these facts for the public?
sadly, it never was about science, it was all about trade $$$
AN update on the TSE prion aka mad cow disease in North America 2012.
Wednesday, March 31, 2010
Atypical BSE in Cattle
To date the OIE/WAHO assumes that the human and animal health standards set out in the BSE chapter for classical BSE (C-Type) applies to all forms of BSE which include the H-type and L-type atypical forms. This assumption is scientifically not completely justified and accumulating evidence suggests that this may in fact not be the case. Molecular characterization and the spatial distribution pattern of histopathologic lesions and immunohistochemistry (IHC) signals are used to identify and characterize atypical BSE. Both the L-type and H-type atypical cases display significant differences in the conformation and spatial accumulation of the disease associated prion protein (PrPSc) in brains of afflicted cattle. Transmission studies in bovine transgenic and wild type mouse models support that the atypical BSE types might be unique strains because they have different incubation times and lesion profiles when compared to C-type BSE. When L-type BSE was inoculated into ovine transgenic mice and Syrian hamster the resulting molecular fingerprint had changed, either in the first or a subsequent passage, from L-type into C-type BSE.
In addition, non-human primates are specifically susceptible for atypical BSE as demonstrated by an approximately 50% shortened incubation time for L-type BSE as compared to C-type. Considering the current scientific information available, it cannot be assumed that these different BSE types pose the same human health risks as C-type BSE or that these risks are mitigated by the same protective measures.
This study will contribute to a correct definition of specified risk material (SRM) in atypical BSE. The incumbent of this position will develop new and transfer existing, ultra-sensitive methods for the detection of atypical BSE in tissue of experimentally infected cattle.
When L-type BSE was inoculated into ovine transgenic mice and Syrian hamster the resulting molecular fingerprint had changed, either in the first or a subsequent passage, from L-type into C-type BSE. In addition, non-human primates are specifically susceptible for atypical BSE as demonstrated by an approximately 50% shortened incubation time for L-type BSE as compared to C-type. Considering the current scientific information available, it cannot be assumed that these different BSE types pose the same human health risks as C-type BSE or that these risks are mitigated by the same protective measures. This study will contribute to a correct definition of specified risk material (SRM) in atypical BSE. The incumbent of this position will develop new and transfer existing, ultra-sensitive methods for the detection of atypical BSE in tissue of experimentally infected cattle.
Thursday, August 12, 2010
Seven main threats for the future linked to prions
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.
Rural and Regional Affairs and Transport References Committee
The possible impacts and consequences for public health, trade and agriculture of the Government's decision to relax import restrictions on beef Final report June 2010
2.65 At its hearing on 14 May 2010, the committee heard evidence from Dr Alan Fahey who has recently submitted a thesis on the clinical neuropsychiatric, epidemiological and diagnostic features of Creutzfeldt-Jakob disease.48 Dr Fahey told the committee of his concerns regarding the lengthy incubation period for transmissible spongiform encephalopathies, the inadequacy of current tests and the limited nature of our current understanding of this group of diseases.49
2.66 Dr Fahey also told the committee that in the last two years a link has been established between forms of atypical CJD and atypical BSE. Dr Fahey said that: They now believe that those atypical BSEs overseas are in fact causing sporadic Creutzfeldt-Jakob disease. They were not sure if it was due to mad sheep disease or a different form. If you look in the textbooks it looks like this is just arising by itself. But in my research I have a summary of a document which states that there has never been any proof that sporadic Creutzfeldt-Jakob disease has arisen de novo-has arisen of itself. There is no proof of that. The recent research is that in fact it is due to atypical forms of mad cow disease which have been found across Europe, have been found in America and have been found in Asia. These atypical forms of mad cow disease typically have even longer incubation periods than the classical mad cow disease.50
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"
Friday, December 23, 2011
Oral Transmission of L-type Bovine Spongiform Encephalopathy in Primate Model
Volume 18, Number 1—January 2012 Dispatch
Saturday, November 19, 2011
Novel Prion Protein in BSE-affected Cattle, Switzerland
Over the next 8-10 weeks, approximately 40% of all the adult mink on the farm died from TME.
The rancher was a ''dead stock'' feeder using mostly (>95%) downer or dead dairy cattle...
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
Bacliff, TX, USA
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.
12 years independent research of available data
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.
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.
From: Terry S. Singeltary Sr. [email@example.com]
Sent: Monday, July 24, 2006 1:09 PM
To: FSIS RegulationsComments
Subject: [Docket No. FSIS-2006-0011] FSIS Harvard Risk Assessment of Bovine Spongiform Encephalopathy (BSE)
Page 1 of 98
FSIS RFEPLY TO TSS ;
Harvard Risk Assessment of Bovine Spongiform Encephalopathy Update, October 31, 2005 INTRODUCTION The United States Department of Agriculture’s Food Safety and Inspection Service (FSIS) held a public meeting on July 25, 2006 in Washington, D.C. to present findings from the Harvard Risk Assessment of Bovine Spongiform Encephalopathy Update, October 31, 2005 (report and model located on the FSIS website:
Comments on technical aspects of the risk assessment were then submitted to FSIS. Comments were received from Food and Water Watch, Food Animal Concerns Trust (FACT), Farm Sanctuary, R-CALF USA, Linda A Detwiler, and Terry S. Singeltary. This document provides itemized replies to the public comments received on the 2005 updated Harvard BSE risk assessment. Please bear the following points in mind:
Saturday, June 19, 2010
U.S. DENIED UPGRADED BSE STATUS FROM OIE
Friday, August 20, 2010
USDA: Animal Disease Traceability August 2010
Friday, November 18, 2011
country-of-origin labeling law (COOL) violates U.S. obligations under WTO rules WT/DS384/R WT/DS386/R
Friday, January 20, 2012
South Korea Lifts Canadian Beef Ban
Saturday, July 23, 2011
CATTLE HEADS WITH TONSILS, BEEF TONGUES, SPINAL CORD, SPECIFIED RISK MATERIALS (SRM's) AND PRIONS, AKA MAD COW DISEASE
Saturday, November 6, 2010
TAFS1 Position Paper on Position Paper on Relaxation of the Feed Ban in the EU
Berne, 2010 TAFS INTERNATIONAL FORUM FOR TRANSMISSIBLE ANIMAL DISEASES AND FOOD SAFETY a non-profit Swiss Foundation
Archive Number 20101206.4364 Published Date 06-DEC-2010 Subject PRO/AH/EDR>
Prion disease update 2010 (11) PRION DISEASE UPDATE 2010 (11)
Monday, May 23, 2011
Atypical Prion Diseases in Humans and Animals 2011
Top Curr Chem (2011)
# Springer-Verlag Berlin Heidelberg 2011
Michael A. Tranulis, Sylvie L. Benestad, Thierry Baron, and Hans Kretzschmar
Although prion diseases, such as Creutzfeldt-Jakob disease (CJD) in humans and scrapie in sheep, have long been recognized, our understanding of their epidemiology and pathogenesis is still in its early stages. Progress is hampered by the lengthy incubation periods and the lack of effective ways of monitoring and characterizing these agents. Protease-resistant conformers of the prion protein (PrP), known as the "scrapie form" (PrPSc), are used as disease markers, and for taxonomic purposes, in correlation with clinical, pathological, and genetic data. In humans, prion diseases can arise sporadically (sCJD) or genetically (gCJD and others), caused by mutations in the PrP-gene (PRNP), or as a foodborne infection, with the agent of bovine spongiform encephalopathy (BSE) causing variant CJD (vCJD). Person-to-person spread of human prion disease has only been known to occur following cannibalism (kuru disease in Papua New Guinea) or through medical or surgical treatment (iatrogenic CJD, iCJD). In contrast, scrapie in small ruminants and chronic wasting disease (CWD) in cervids behave as infectious diseases within these species. Recently, however, so-called atypical forms of prion diseases have been discovered in sheep (atypical/Nor98 scrapie) and in cattle, BSE-H and BSE-L. These maladies resemble sporadic or genetic human prion diseases and might be their animal equivalents. This hypothesis also raises the significant public health question of possible epidemiological links between these diseases and their counterparts in humans.
M.A. Tranulis (*)
Norwegian School of Veterinary Science, Oslo, Norway
Norwegian Veterinary Institute, Oslo, Norway
Agence Nationale de Se´curite´ Sanitaire, ANSES, Lyon, France
Ludwig-Maximilians University of Munich, Munich, Germany
Keywords Animal Atypical Atypical/Nor98 scrapie BSE-H BSE-L Human Prion disease Prion strain Prion type
snip...SEE MORE HERE ;
Aspects of the Cerebellar Neuropathology in Nor98
Gavier-Widén, D1; Benestad, SL2; Ottander, L1; Westergren, E1 1National Veterinary Insitute, Sweden; 2National Veterinary Institute,
Norway Nor98 is a prion disease of old sheep and goats. This atypical form of scrapie was first described in Norway in 1998. Several features of Nor98 were shown to be different from classical scrapie including the distribution of disease associated prion protein (PrPd) accumulation in the brain. The cerebellum is generally the most affected brain area in Nor98. The study here presented aimed at adding information on the neuropathology in the cerebellum of Nor98 naturally affected sheep of various genotypes in Sweden and Norway. A panel of histochemical and immunohistochemical (IHC) stainings such as IHC for PrPd, synaptophysin, glial fibrillary acidic protein, amyloid, and cell markers for phagocytic cells were conducted. The type of histological lesions and tissue reactions were evaluated. The types of PrPd deposition were characterized. The cerebellar cortex was regularly affected, even though there was a variation in the severity of the lesions from case to case. Neuropil vacuolation was more marked in the molecular layer, but affected also the granular cell layer. There was a loss of granule cells. Punctate deposition of PrPd was characteristic. It was morphologically and in distribution identical with that of synaptophysin, suggesting that PrPd accumulates in the synaptic structures. PrPd was also observed in the granule cell layer and in the white matter. The pathology features of Nor98 in the cerebellum of the affected sheep showed similarities with those of sporadic Creutzfeldt-Jakob disease in humans.
***The pathology features of Nor98 in the cerebellum of the affected sheep showed similarities with those of sporadic Creutzfeldt-Jakob disease in humans.
NOR98 SHOWS MOLECULAR FEATURES REMINISCENT OF GSS
R. Nonno1, E. Esposito1, G. Vaccari1, E. Bandino2, M. Conte1, B. Chiappini1, S. Marcon1, M. Di Bari1, S.L. Benestad3, U. Agrimi1 1 Istituto Superiore di Sanità, Department of Food Safety and Veterinary Public Health, Rome, Italy (firstname.lastname@example.org); 2 Istituto Zooprofilattico della Sardegna, Sassari, Italy; 3 National Veterinary Institute, Department of Pathology, Oslo, Norway
Molecular variants of PrPSc are being increasingly investigated in sheep scrapie and are generally referred to as "atypical" scrapie, as opposed to "classical scrapie". Among the atypical group, Nor98 seems to be the best identified. We studied the molecular properties of Italian and Norwegian Nor98 samples by WB analysis of brain homogenates, either untreated, digested with different concentrations of proteinase K, or subjected to enzymatic deglycosylation. The identity of PrP fragments was inferred by means of antibodies spanning the full PrP sequence. We found that undigested brain homogenates contain a Nor98-specific PrP fragment migrating at 11 kDa (PrP11), truncated at both the C-terminus and the N-terminus, and not N-glycosylated. After mild PK digestion, Nor98 displayed full-length PrP (FL-PrP) and N-glycosylated C-terminal fragments (CTF), along with increased levels of PrP11. Proteinase K digestion curves (0,006-6,4 mg/ml) showed that FL-PrP and CTF are mainly digested above 0,01 mg/ml, while PrP11 is not entirely digested even at the highest concentrations, similarly to PrP27-30 associated with classical scrapie. Above 0,2 mg/ml PK, most Nor98 samples showed only PrP11 and a fragment of 17 kDa with the same properties of PrP11, that was tentatively identified as a dimer of PrP11. Detergent solubility studies showed that PrP11 is insoluble in 2% sodium laurylsorcosine and is mainly produced from detergentsoluble, full-length PrPSc. Furthermore, among Italian scrapie isolates, we found that a sample with molecular and pathological properties consistent with Nor98 showed plaque-like deposits of PrPSc in the thalamus when the brain was analysed by PrPSc immunohistochemistry. Taken together, our results show that the distinctive pathological feature of Nor98 is a PrP fragment spanning amino acids ~ 90-155. This fragment is produced by successive N-terminal and C-terminal cleavages from a full-length and largely detergent-soluble PrPSc, is produced in vivo and is extremely resistant to PK digestion.
*** Intriguingly, these conclusions suggest that some pathological features of Nor98 are reminiscent of Gerstmann-Sträussler-Scheinker disease.
A newly identified type of scrapie agent can naturally infect sheep with resistant PrP genotypes
Annick Le Dur*,?, Vincent Béringue*,?, Olivier Andréoletti?, Fabienne Reine*, Thanh Lan Laï*, Thierry Baron§, Bjørn Bratberg¶, Jean-Luc Vilotte?, Pierre Sarradin**, Sylvie L. Benestad¶, and Hubert Laude*,? +Author Affiliations
*Virologie Immunologie Moléculaires and ?Génétique Biochimique et Cytogénétique, Institut National de la Recherche Agronomique, 78350 Jouy-en-Josas, France; ?Unité Mixte de Recherche, Institut National de la Recherche Agronomique-Ecole Nationale Vétérinaire de Toulouse, Interactions Hôte Agent Pathogène, 31066 Toulouse, France; §Agence Française de Sécurité Sanitaire des Aliments, Unité Agents Transmissibles Non Conventionnels, 69364 Lyon, France; **Pathologie Infectieuse et Immunologie, Institut National de la Recherche Agronomique, 37380 Nouzilly, France; and ¶Department of Pathology, National Veterinary Institute, 0033 Oslo, Norway
***Edited by Stanley B. Prusiner, University of California, San Francisco, CA (received for review March 21, 2005)
Abstract Scrapie in small ruminants belongs to transmissible spongiform encephalopathies (TSEs), or prion diseases, a family of fatal neurodegenerative disorders that affect humans and animals and can transmit within and between species by ingestion or inoculation. Conversion of the host-encoded prion protein (PrP), normal cellular PrP (PrPc), into a misfolded form, abnormal PrP (PrPSc), plays a key role in TSE transmission and pathogenesis. The intensified surveillance of scrapie in the European Union, together with the improvement of PrPSc detection techniques, has led to the discovery of a growing number of so-called atypical scrapie cases. These include clinical Nor98 cases first identified in Norwegian sheep on the basis of unusual pathological and PrPSc molecular features and "cases" that produced discordant responses in the rapid tests currently applied to the large-scale random screening of slaughtered or fallen animals. Worryingly, a substantial proportion of such cases involved sheep with PrP genotypes known until now to confer natural resistance to conventional scrapie. Here we report that both Nor98 and discordant cases, including three sheep homozygous for the resistant PrPARR allele (A136R154R171), efficiently transmitted the disease to transgenic mice expressing ovine PrP, and that they shared unique biological and biochemical features upon propagation in mice. *** These observations support the view that a truly infectious TSE agent, unrecognized until recently, infects sheep and goat flocks and may have important implications in terms of scrapie control and public health.
Monday, December 1, 2008
When Atypical Scrapie cross species barriers
Andreoletti O., Herva M. H., Cassard H., Espinosa J. C., Lacroux C., Simon S., Padilla D., Benestad S. L., Lantier F., Schelcher F., Grassi J., Torres, J. M., UMR INRA ENVT 1225, Ecole Nationale Veterinaire de Toulouse.France; ICISA-INlA, Madrid, Spain; CEA, IBiTec-5, DSV, CEA/Saclay, Gif sur Yvette cedex, France; National Veterinary Institute, Postboks 750 Sentrum, 0106 Oslo, Norway, INRA IASP, Centre INRA de Tours, 3738O Nouzilly, France.
Atypical scrapie is a TSE occurring in small ruminants and harbouring peculiar clinical, epidemiological and biochemical properties. Currently this form of disease is identified in a large number of countries. In this study we report the transmission of an atypical scrapie isolate through different species barriers as modeled by transgenic mice (Tg) expressing different species PRP sequence.
The donor isolate was collected in 1995 in a French commercial sheep flock. inoculation into AHQ/AHQ sheep induced a disease which had all neuro-pathological and biochemical characteristics of atypical scrapie. Transmitted into Transgenic mice expressing either ovine or PrPc, the isolate retained all the described characteristics of atypical scrapie.
Surprisingly the TSE agent characteristics were dramatically different v/hen passaged into Tg bovine mice. The recovered TSE agent had biological and biochemical characteristics similar to those of atypical BSE L in the same mouse model. Moreover, whereas no other TSE agent than BSE were shown to transmit into Tg porcine mice, atypical scrapie was able to develop into this model, albeit with low attack rate on first passage.
Furthermore, after adaptation in the porcine mouse model this prion showed similar biological and biochemical characteristics than BSE adapted to this porcine mouse model. Altogether these data indicate.
(i) the unsuspected potential abilities of atypical scrapie to cross species barriers
(ii) the possible capacity of this agent to acquire new characteristics when crossing species barrier
These findings raise some interrogation on the concept of TSE strain and on the origin of the diversity of the TSE agents and could have consequences on field TSE control measures.
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.
BSE - ATYPICAL LESION DISTRIBUTION (RBSE 92-21367)
NEW BRAIN DISORDER
3. WHAT ABOUT REPORTS OF NEW FORM OF BSE ?
THE VETERINARY RECORD HAS PUBLISHED AN ARTICLE ON A NEW BRAIN DISORDER OF CATTLE DISCOVERED THROUGH OUR CONTROL MEASURES FOR BSE. ALTHOUGH IT PRESENTS SIMILAR CLINICAL SIGNS TO BSE THERE ARE MAJOR DIFFERENCES IN HISTOPATHOLOGY AND INCUBATION PERIODS BETWEEN THE TWO. MUST EMPHASISE THAT THIS IS _NOT_ BSE.
4. IS THIS NEW BRAIN DISORDER A THREAT ?
WE DO NOT EVEN KNOW WHETHER THE AGENT OF THIS DISEASE IS TRANSMISSIBLE. IN ANY CASE, CASES SO FAR IDENTIFIED HAD SHOWN SIMILAR SYMPTOMS TO THOSE OF BSE, AND THEREFORE HAVE BEEN SLAUGHTERED AND INCINERATED, SO THAT IF A TRANSMISSIBLE AGENT WERE INVOLVED IT WOULD HAVE BEEN ELIMINATED. ...
Tuesday, November 17, 2009
SEAC NEW RESULTS ON IDIOPATHIC BRAINSTEM NEURONAL CHROMATOLYSIS (IBNC) FROM THE VETERINARY LABORATORIES AGENCY (VLA) SEAC 103/1
NEW RESULTS ON IDIOPATHIC BRAINSTEM NEURONAL CHROMATOLYSIS
"All of the 15 cattle tested showed that the brains had abnormally accumulated PrP"
''THE LINE TO TAKE'' ON IBNC $$$ 1995 $$$
page 9 of 14 ;
30. The Committee noted that the results were unusual. the questioned whether there could be coincidental BSE infection or contamination with scrapie. Dr. Tyrell noted that the feeling of the committee was that this did not represent a new agent but it was important to be prepared to say something publicly about these findings. A suggested line to take was that these were scientifically unpublishable results but in line with the policy of openness they would be made publicly available and further work done to test their validity. Since the BSE precautions were applied to IBNC cases, human health was protected. Further investigations should be carried out on isolations from brains of IBNC cases with removal of the brain and subsequent handling under strict conditions to avoid the risk of any contamination.
31. Mr. Bradley informed the Committee that the CVO had informed the CMO about the IBNC results and the transmission from retina and he, like the Committee was satisfied that the controls already in place or proposed were adequate. ...
snip... see full text
Wednesday, July 28, 2010
Atypical prion proteins and IBNC in cattle DEFRA project code SE1796 FOIA Final report
BSE ATYPICAL LESION DISTRIBUTION
Tuesday, November 02, 2010
BSE - ATYPICAL LESION DISTRIBUTION (RBSE 92-21367) statutory (obex only) diagnostic criteria CVL 1992
Thursday, June 23, 2011
Experimental H-type bovine spongiform encephalopathy characterized by plaques and glial- and stellate-type prion protein deposits
Friday, December 30, 2011; ;
Feds back Quebec R+D for SRM removal equipment Canada
Friday, January 6, 2012
OIE 2012 Training Manual on Wildlife Diseases and Surveillance and TSE Prion disease
Monday, January 2, 2012
EFSA Minutes of the 6th Meeting of the EFSA Scientific Network on BSE-TSE Brussels, 29-30 November 2011
Friday, March 4, 2011
Alberta dairy cow found with mad cow disease
Wednesday, August 11, 2010
REPORT ON THE INVESTIGATION OF THE SIXTEENTH CASE OF BOVINE SPONGIFORM ENCEPHALOPATHY (BSE) IN CANADA
Thursday, August 19, 2010
REPORT ON THE INVESTIGATION OF THE SEVENTEENTH CASE OF BOVINE SPONGIFORM ENCEPHALOPATHY (BSE) IN CANADA
Thursday, February 10, 2011
TRANSMISSIBLE SPONGIFORM ENCEPHALOPATHY REPORT UPDATE CANADA FEBRUARY 2011 and how to hide mad cow disease in Canada Current as of: 2011-01-31
Increased Atypical Scrapie Detections
Press reports indicate that increased surveillance is catching what otherwise would have been unreported findings of atypical scrapie in sheep. In 2009, five new cases have been reported in Quebec, Ontario, Alberta, and Saskatchewan. With the exception of Quebec, all cases have been diagnosed as being the atypical form found in older animals. Canada encourages producers to join its voluntary surveillance program in order to gain scrapie-free status. The World Animal Health will not classify Canada as scrapie-free until no new cases are reported for seven years. The Canadian Sheep Federation is calling on the government to fund a wider surveillance program in order to establish the level of prevalence prior to setting an eradication date. Besides long-term testing, industry is calling for a compensation program for farmers who report unusual deaths in their flocks.
Thursday, December 22, 2011
Chronic Wasting Disease discovered on game farm Saskatchewan Wednesday Dec. 21, 2011
PRIONET CANADA Canada’s prion research network Annual Report 2010 / 2011
J Vet Diagn Invest 21:454-463 (2009)
Nor98 scrapie identified in the United States
Christie M. Loiacono,' Bruce V. Thomsen, S. Mark Hall, Matti Kiupe!, Diane Sutton, Katherine O'Rourke, Bradd Barr, Lucy Anthenill, Deiwyn Keane
A distinct strain of scrapic identified in sheep of Norway in 1998 has since been identified in numerous countries throughout Europe. The disease is known as Nor98 or Not-98-like scrapic. among other names. Distinctions between classic scrapie and Nor98 scrapie are made based on histopathologv and immunodiagnostic results. There are also differences in the epidemiology, typical signalment, and likelihood of clinical signs being observed. In addition, sheep that have genotypes associated with resistance to classic scrapie are not spared from Nor98 disease. The various differences between classic and Nor98 scrapie have been consistently reported in the vast majority of cases described across Europe. The current study describes in detail the patholo gic changes and diagnostic results of the first 6 cases of' Nor98 scrapic disease diagnosed in sheep of the United States.
Key words: Hisiopathology: Nor98: PrP imniunolabeling; scrapie: sheep.
The first case identified as consistent with Nor98 scrapie had nonclassic PrP distribution in brain tissue, no PrPSC in lymph tissue, and nonclassic migration of protein bands on a Western blot test. The animal was an aged, mottled-faced ewe that was traced back to a commercial flock in Wyoming. ...
The second case was a clinically normal 8-year-old Suffolk ewe that had been in a quarantined flock for 5 years at a USDA facility in Iowa.
A 16-year-old, white-faced, cross-bred wether was born to a black-faced ewe. He lived his entire life as a pet on a farm in California.
The fourth case of Nor98 scrapie was identified in an approximately 8-year-old Dorset ewe that was born into a flock of approximately 20 ewes in Indiana.
The fifth case was a clinically normal, approximately 3-year-old, white-faced, cross-bred ewe from an approximately 400 head commercial flock in Minnesota.
The sixth case of Nor98 scrapie was identified in a 4-year-old, white-faced ewe that was purchased and added to a commercial flock in Pennsylvania
see full text ;
Wednesday, January 18, 2012
Selection of Distinct Strain Phenotypes in Mice Infected by Ovine Natural Scrapie Isolates Similar to CH1641 Experimental Scrapie
Journal of Neuropathology & Experimental Neurology:
February 2012 - Volume 71 - Issue 2 - p 140–147
Wednesday, January 11, 2012
Bucks for brains on offer to cattle and sheep producers Queensland TSE PRION TESTING
Wednesday, January 18, 2012
BSE IN GOATS CAN BE MISTAKEN FOR SCRAPIE February 1, 2012
Wednesday, February 16, 2011
SCRAPIE TRANSMISSION TO CHIMPANZEES
Sunday, April 18, 2010
SCRAPIE AND ATYPICAL SCRAPIE TRANSMISSION STUDIES A REVIEW 2010
Monday, April 25, 2011
Experimental Oral Transmission of Atypical Scrapie to Sheep
Volume 17, Number 5-May 2011
Sunday, March 28, 2010
Nor-98 atypical Scrapie, atypical BSE, spontaneous TSE, trade policy, sound science ?
Monday, November 30, 2009
USDA AND OIE COLLABORATE TO EXCLUDE ATYPICAL SCRAPIE NOR-98 ANIMAL HEALTH CODE
I strenuously urge the USDA and the OIE et al to revoke the exemption of the legal global trading of atypical Nor-98 scrapie TSE. ...TSS
Friday, February 11, 2011
Atypical/Nor98 Scrapie Infectivity in Sheep Peripheral Tissues
Wednesday, January 18, 2012
BSE IN GOATS CAN BE MISTAKEN FOR SCRAPIE
February 1, 2012
Monday, January 16, 2012
9 GAME FARMS IN WISCONSIN TEST POSITIVE FOR CWD
Tuesday, December 20, 2011
CHRONIC WASTING DISEASE CWD WISCONSIN Almond Deer (Buckhorn Flats) Farm Update DECEMBER 2011
CHRONIC WASTING DISEASE CWD WISCONSIN Almond Deer (Buckhorn Flats) Farm Update DECEMBER 2011
NATURAL RESOURCES BOARD AGENDA ITEM
SUBJECT: Inf01mation Item: Almond Deer Fatm Update
FOR: DECEIVIBER 2011 BOARD MEETING
These laboratory results show that 60 of the 76 animals tested positive for chronic wasting disease. The 76 deer constituted the breeding herd on Hall’s farm. He also operated a hunting preserve on the property until 2005. Four deer, two does and two fawns, the only deer remaining in the former preserve, were killed and tested as well. CWD was not detected in those animals. The total number of deer to test positive from this farm from the initial discovery to final depopulation is 82. The CWD infection rate was nearly 80%, the highest ever in a North American captive herd.
Despite the five year premise plan and site decontamination, The WI DNR has concerns over the bioavailability of infectious prions at this site to wild white-tail deer should these fences be removed. Current research indicates that prions can persist in soil for a minimum of 3 years. However, Georgsson et al. (2006) concluded that prions that produced scrapie disease in sheep remained bioavailable and infectious for at least 16 years in natural Icelandic environments, most likely in contaminated soil. Additionally, the authors reported that from 1978-2004, scrapie recurred on 33 sheep farms, of which 9 recurrences occurred 14-21 years after initial culling and subsequent restocking efforts; these findings further emphasize the effect of environmental contamination on sustaining TSE infectivity and that long-term persistence of prions in soils may be substantially greater than previously thought. Evidence of environmental transmission also was documented in a Colorado research facility where mule deer became infected with CWD in two of three paddocks where infected deer carcasses had decomposed on site 1.8 years earlier, and in one of three paddocks where infected deer had last resided 2.2 years earlier (Miller et al. 2004).
FULL TEXT AND MORE HERE ;
*** Spraker suggested an interesting explanation for the occurrence of CWD. The deer pens at the Foot Hills Campus were built some 30-40 years ago by a Dr. Bob Davis. At or abut that time, allegedly, some scrapie work was conducted at this site. When deer were introduced to the pens they occupied ground that had previously been occupied by sheep.
(PLEASE NOTE SOME OF THESE OLD UK GOVERNMENT FILE URLS ARE SLOW TO OPEN, AND SOMETIMES YOU MAY HAVE TO CLICK ON MULTIPLE TIMES, PLEASE BE PATIENT, ANY PROBLEMS PLEASE WRITE ME PRIVATELY, AND I WILL TRY AND FIX OR SEND YOU OLD PDF FILE...TSS)
Why Americans, As Well as Koreans, Should Be Worried About Mad Cow Tainted USA Beef By Terry S. Singeltary Sr. May 15, 2008 Straight to the Source
Tuesday, May 13, 2008
Concerned Americans against Mad Cow Disease STATEMENT OF SOLIDARITY with Koreans May 13, 2008
Wednesday, February 10, 2010
The Honorable Ms. Kim Min-sun Anti-US Beef Actress Prevails in Court
Friday, January 20, 2012
South Korea Lifts Canadian Beef Ban
Tuesday, November 08, 2011
Can Mortality Data Provide Reliable Indicators for Creutzfeldt-Jakob Disease Surveillance? A Study in France from 2000 to 2008 Vol. 37, No. 3-4, 2011
Conclusions:These findings raise doubt about the possibility of a reliable CJD surveillance only based on mortality data.
Sunday, September 25, 2011
Clinical Heidenhain Variant Of Sporadic Creutzfeldt-Jakob Disease (CJD) With Co-occurrence Of Prion Protein Types 1 and 2
Saturday, March 5, 2011
MAD COW ATYPICAL CJD PRION TSE CASES WITH CLASSIFICATIONS PENDING ON THE RISE IN NORTH AMERICA
Terry S. Singeltary Sr. on the Creutzfeldt-Jakob Disease Public Health Crisis
full text with source references ;
2011 Monday, September 26, 2011
L-BSE BASE prion and atypical sporadic CJD
Terry S. Singeltary Sr. P.O. Box 42 Bacliff, Texas USA 77518 email@example.com