The Canadian Management of Bovine Spongiform Encephalopathy in Historical
and Scientific Perspective, 1990-2014
Historical Article
The Canadian Management of Bovine Spongiform Encephalopathy in Historical
and Scientific Perspective, 1990-2014
Alexandra E. Quimbya1 and Michel C.F. Shamya2 c1
a1 Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
a2 Department of Medicine (Neurology), University of Ottawa, Ottawa,
Ontario, Canada.
Abstract
On February 11, 2015, the Canadian Food Inspection Agency announced that a
cow born and raised in Alberta had tested positive for bovine spongiform
encephalopathy (BSE), commonly known as mad cow disease. BSE is a prion disease
of cattle that, when transmitted to humans, produces a fatal neurodegenerative
disease known as variant Creutzfeldt-Jakob disease. We believe that this latest
case of BSE in Canadian cattle suggests the timeliness of a review of the
management of BSE in Canada from a historically and scientifically informed
perspective. In this article, we ask: how did the Canadian management of BSE
between 1990 and 2014 engage with the contemporary understanding of BSE’s human
health implications? We propose that Canadian policies largely ignored the
implicit medical nature of BSE, treating it as a purely agricultural and
veterinary issue. In this way, policies to protect Canadians were often delayed
and incomplete, in a manner disturbingly reminiscent of Britain’s failed
management of BSE. Despite assurances to the contrary, it is premature to
conclude that BSE (and with it the risk of variant Creutzfeldt-Jakob disease) is
a thing of Canada’s past: BSE remains very much an issue in Canada’s present.
RÉSUMÉ
Perspective historique et scientifique sur la gestion de l’encéphalopathie
spongiforme bovine au Canada de 1990 à 2014. Le 11 février 2015 l’Agence
canadienne d’inspection des aliments a annoncé que le test de dépistage de
l’encéphalopathie spongiforme bovine (ESB), communément appelée maladie de la
vache folle, s’était avéré positif chez une vache née et élevée en Alberta.
L’ESB est une maladie à prion chez les bovins qui, quand elle est transmise aux
humains, cause une maladie neurodégénérative fatale connue sous le nom de
variante de la maladie de Creutzfeldt-Jakob. Nous croyons que ce cas récent
d’ESB chez une vache canadienne indique qu’il est temps de revoir la gestion de
l’ESB au Canada sous un éclairage historique et scientifique. Dans cet article,
nous posons la question suivante : comment la gestion de l’ESB au Canada de 1990
à 2014 s’est-elle adaptée aux connaissances actuelles des répercussions de l’ESB
sur la santé humaine? Nous suggérons que les politiques canadiennes ont ignoré
dans une large mesure la nature médicale inhérente à l’ESB en la traitant comme
un problème purement du domaine de l’agriculture et du domaine vétérinaire.
Souvent les politiques destinées à protéger les Canadiens ont donc été tardives
et incomplètes, rappelant de façon préoccupante l’échec de la Grande-Bretagne à
gérer l’ESB. En dépit d’affirmations contraires, il est prématuré de conclure
que l’ESB (et ainsi le risque de contracter la variante de la maladie de
Creutzfeldt-Jakob) est chose du passé au Canada : l’ESB y demeure un problème
actuel.
(Received December 12 2014)
(Accepted June 19 2015)
Keywords Creutzfeldt-Jakob Disease; Healther Services Research; History;
Neurosciences; Prion
Correspondence
c1 Correspondence to: Michel Shamy, 1053 Carling Avenue, Room C2182a,
Ottawa, ON K1Y 4E9, Canada. Email: mshamy@toh.on.ca.
Friday, July 10, 2015
CANADA TRANSMISSIBLE SPONGIFORM ENCEPHALOPATHY TSE PRION UPDATE
Monday, February 23, 2015
20th BSE Case Raises New Concerns about Canada's Feeding Practices and
Voluntary Testing Program; Highlights Importance of COOL
Friday, February 20, 2015
A BSE CANADIAN COW MAD COW UPDATE Transcript - Briefing (February 18, 2015)
EDMONTON - Some of former Alberta premier Ralph Klein's most colourful
quotes — and the reactions they elicited:
SNIP...
"This all came about through the discovery of a single, isolated case of
mad cow disease in one Alberta cow on May 20th. The farmer — I think he was a
Louisiana fish farmer who knew nothing about cattle ranching. I guess any
self-respecting rancher would have shot, shovelled and shut up, but he didn't do
that." — Klein recalls how the mad cow crisis started and rancher Marwyn
Peaster's role. The premier was speaking at the Western Governors Association
meeting in Big Sky, Mont. September 2004.
"The premier meant that in an ironic or almost a sarcastic way." — Klein
spokesman Gordon Turtle.
---
"You would have to eat 10 billion meals of brains, spinal cords, ganglia,
eyeballs and tonsils." — Klein speaking in Montreal in January 2005 on the risk
of humans contracting mad cow disease.
---
"I would offer $5 billion to have a Japanese person to come over here and
eat nothing but Alberta beef for a year. And if he gets mad cow disease, I would
be glad to give him $5 billion — make it $10 billion — Canadian." — Klein
speaking after Japan closed its borders to Canadian beef.
---
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
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
Friday, March 4, 2011
Alberta dairy cow found with mad cow disease
Tuesday, May 21, 2013
Canada, USA, Bad feed, mad cows: Why we know three BSE cases had a common
origin and why the SSS policy is in full force $$$
Thursday, March 29, 2012
atypical Nor-98 Scrapie has spread from coast to coast in the USA 2012
NIAA Annual Conference April 11-14, 2011San Antonio, Texas
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.
Current as of: 2015-01-31
Sheep flocks and/or goat herds confirmed to be infected with classical
scrapie in Canada in 2015 Date confirmed Location Animal type infected January 5
Ontario Goat
Tuesday, February 10, 2015
Alberta Canada First case of chronic wasting disease found in farm elk
since 2002
Saturday, March 21, 2015
***Canada and United States Creutzfeldt Jakob TSE Prion Disease Incidence
Rates Increasing ***
CANADA SEE STEADY INCREASE OF THE SPORADIC CJD’S AND THE VPSPR’S (sporadic
CJD’s). ...tss
PLEASE NOTE, type determination pending Creutzfeldt Jakob Disease (tdpCJD)
in Canada is also on a steady increase.
please see ;
> 3. Final classification of 50 cases from 2009, 2010, 2011 and 2012 is
pending.
CJD Deaths Reported by CJDSS1, 1994-20122
As of May 31, 2012
Deaths of Definite and Probable CJD
Year Sporadic Iatrogenic Familial GSS FFI vCJD Total
1994 2 0 0 1 0 0 3
1995 3 0 0 0 0 0 3
1996 13 0 0 0 0 0 13
1997 16 0 1 1 0 0 18
1998 22 1 0 1 0 0 24
1999 26 2 2 1 0 0 31
2000 32 0 0 3 0 0 35
2001 27 0 2 1 0 0 30
2002 31 0 2 2 0 1 36
2003 27 1 1 0 0 0 29
2004 42 0 1 0 0 0 43
2005 42 0 0 2 0 0 44
2006 39 0 1 3 1 0 44
2007 35 0 0 4 0 0 39
2008 48 0 1 0 0 0 49
2009 48 0 3 2 0 0 53
2010 34 0 3 0 0 0 37
2011 37 0 2 1 0 1 41
2012 1 0 0 0 0 0 1
Total 525 4 19 22 1 2 573
1. CJDSS began in 1998
2. Data before 1998 are retrospective and partial, data from 1998 to 2008
are complete, and data for 2009 - 2012 are provisional
3. Final classification of 50 cases from 2009, 2010, 2011 and 2012 is
pending.
CJD Deaths Reported by CJDSS1, 1994-20122
As of May 31, 2012
SEE DECEMBER 2012 CANADA
Saturday, June 15, 2013
Canada Fraser Health Statement on Creutzfeldt-Jakob Disease outbreak
O.05: Transmission of prions to primates after extended silent incubation
periods: Implications for BSE and scrapie risk assessment in human populations
Emmanuel Comoy, Jacqueline Mikol, Val erie Durand, Sophie Luccantoni,
Evelyne Correia, Nathalie Lescoutra, Capucine Dehen, and Jean-Philippe Deslys
Atomic Energy Commission; Fontenay-aux-Roses, France
Prion diseases (PD) are the unique neurodegenerative proteinopathies
reputed to be transmissible under field conditions since decades. The
transmission of Bovine Spongiform Encephalopathy (BSE) to humans evidenced that
an animal PD might be zoonotic under appropriate conditions. Contrarily, in the
absence of obvious (epidemiological or experimental) elements supporting a
transmission or genetic predispositions, PD, like the other proteinopathies, are
reputed to occur spontaneously (atpical animal prion strains, sporadic CJD
summing 80% of human prion cases). Non-human primate models provided the first
evidences supporting the transmissibiity of human prion strains and the zoonotic
potential of BSE. Among them, cynomolgus macaques brought major information for
BSE risk assessment for human health (Chen, 2014), according to their
phylogenetic proximity to humans and extended lifetime. We used this model to
assess the zoonotic potential of other animal PD from bovine, ovine and cervid
origins even after very long silent incubation periods. *** We recently observed
the direct transmission of a natural classical scrapie isolate to macaque after
a 10-year silent incubation period, ***with features similar to some reported
for human cases of sporadic CJD, albeit requiring fourfold longe incubation than
BSE. Scrapie, as recently evoked in humanized mice (Cassard, 2014), ***is the
third potentially zoonotic PD (with BSE and L-type BSE), ***thus questioning the
origin of human sporadic cases. We will present an updated panorama of our
different transmission studies and discuss the implications of such extended
incubation periods on risk assessment of animal PD for human health.
===============
***thus questioning the origin of human sporadic cases...TSS
===============
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...
-------- Original Message --------
Subject: re-BSE prions propagate as either variant CJD-like or sporadic CJD
Date: Thu, 28 Nov 2002 10:23:43 -0000
From: "Asante, Emmanuel A" e.asante@ic.ac.uk
To: "'flounder@wt.net'" flounder@wt.net
Dear Terry,
I have been asked by Professor Collinge to respond to your request. I am a
Senior Scientist in the MRC Prion Unit and the lead author on the paper. I have
attached a pdf copy of the paper for your attention.
Thank you for your interest in the paper.
In respect of your first question, the simple answer is, ***yes. As you
will find in the paper, we have managed to associate the alternate phenotype to
type 2 PrPSc, the commonest sporadic CJD. It is too early to be able to claim
any further sub-classification in respect of Heidenhain variant CJD or Vicky
Rimmer's version. It will take further studies, which are on-going, to establish
if there are sub-types to our initial finding which we are now reporting. The
main point of the paper is that, as well as leading to the expected new variant
CJD phenotype, BSE transmission to the 129-methionine genotype can lead to an
alternate phenotype which is indistinguishable from type 2 PrPSc.
I hope reading the paper will enlighten you more on the subject. If I can
be of any further assistance please to not hesitate to ask. Best wishes.
Emmanuel Asante
<>
____________________________________
Dr. Emmanuel A Asante MRC Prion Unit & Neurogenetics Dept. Imperial
College School of Medicine (St. Mary's) Norfolk Place, LONDON W2 1PG Tel: +44
(0)20 7594 3794 Fax: +44 (0)20 7706 3272 email: e.asante@ic.ac.uk (until
9/12/02) New e-mail: e.asante@prion.ucl.ac.uk (active from now)
____________________________________
***Our study demonstrates susceptibility of adult cattle to oral
transmission of classical BSE. ***
***our findings suggest that possible transmission risk of H-type BSE to
sheep and human. ***
P.86: Estimating the risk of transmission of BSE and scrapie to ruminants
and humans by protein misfolding cyclic amplification
Morikazu Imamura, Naoko Tabeta, Yoshifumi Iwamaru, and Yuichi Murayama
National Institute of Animal Health; Tsukuba, Japan
To assess the risk of the transmission of ruminant prions to ruminants and
humans at the molecular level, we investigated the ability of abnormal prion
protein (PrPSc) of typical and atypical BSEs (L-type and H-type) and typical
scrapie to convert normal prion protein (PrPC) from bovine, ovine, and human to
proteinase K-resistant PrPSc-like form (PrPres) using serial protein misfolding
cyclic amplification (PMCA).
Six rounds of serial PMCA was performed using 10% brain homogenates from
transgenic mice expressing bovine, ovine or human PrPC in combination with PrPSc
seed from typical and atypical BSE- or typical scrapie-infected brain
homogenates from native host species. In the conventional PMCA, the conversion
of PrPC to PrPres was observed only when the species of PrPC source and PrPSc
seed matched. However, in the PMCA with supplements (digitonin, synthetic polyA
and heparin), both bovine and ovine PrPC were converted by PrPSc from all tested
prion strains. On the other hand, human PrPC was converted by PrPSc from typical
and H-type BSE in this PMCA condition.
Although these results were not compatible with the previous reports
describing the lack of transmissibility of H-type BSE to ovine and human
transgenic mice, ***our findings suggest that possible transmission risk of
H-type BSE to sheep and human. Bioassay will be required to determine whether
the PMCA products are infectious to these animals.
================
***Our study demonstrates susceptibility of adult cattle to oral
transmission of classical BSE. ***
P.86: Estimating the risk of transmission of BSE and scrapie to ruminants
and humans by protein misfolding cyclic amplification
Morikazu Imamura, Naoko Tabeta, Yoshifumi Iwamaru, and Yuichi Murayama
National Institute of Animal Health; Tsukuba, Japan
To assess the risk of the transmission of ruminant prions to ruminants and
humans at the molecular level, we investigated the ability of abnormal prion
protein (PrPSc) of typical and atypical BSEs (L-type and H-type) and typical
scrapie to convert normal prion protein (PrPC) from bovine, ovine, and human to
proteinase K-resistant PrPSc-like form (PrPres) using serial protein misfolding
cyclic amplification (PMCA).
Six rounds of serial PMCA was performed using 10% brain homogenates from
transgenic mice expressing bovine, ovine or human PrPC in combination with PrPSc
seed from typical and atypical BSE- or typical scrapie-infected brain
homogenates from native host species. In the conventional PMCA, the conversion
of PrPC to PrPres was observed only when the species of PrPC source and PrPSc
seed matched. However, in the PMCA with supplements (digitonin, synthetic polyA
and heparin), both bovine and ovine PrPC were converted by PrPSc from all tested
prion strains. On the other hand, human PrPC was converted by PrPSc from typical
and H-type BSE in this PMCA condition.
Although these results were not compatible with the previous reports
describing the lack of transmissibility of H-type BSE to ovine and human
transgenic mice, ***our findings suggest that possible transmission risk of
H-type BSE to sheep and human. Bioassay will be required to determine whether
the PMCA products are infectious to these animals.
===============
***however in 1 C-type challenged animal, Prion 2015 Poster Abstracts S67
PrPsc was not detected using rapid tests for BSE.
***Subsequent testing resulted in the detection of pathologic lesion in
unusual brain location and PrPsc detection by PMCA only.
IBNC Tauopathy or TSE Prion disease, it appears, no one is sure
Posted by flounder on 03 Jul 2015 at 16:53 GMT
10 years post mad cow feed ban August 1997
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
RECALLS AND FIELD CORRECTIONS: VETERINARY MEDICINES -- CLASS II
PRODUCT
Bulk cattle feed made with recalled Darling's 85% Blood Meal, Flash Dried,
Recall # V-024-2007
CODE
Cattle feed delivered between 01/12/2007 and 01/26/2007
RECALLING FIRM/MANUFACTURER
Pfeiffer, Arno, Inc, Greenbush, WI. by conversation on February 5, 2007.
Firm initiated recall is ongoing.
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
___________________________________
PRODUCT
Custom dairy premix products: MNM ALL PURPOSE Pellet, HILLSIDE/CDL Prot-
Buffer Meal, LEE, M.-CLOSE UP PX Pellet, HIGH DESERT/ GHC LACT Meal, TATARKA, M
CUST PROT Meal, SUNRIDGE/CDL PROTEIN Blend, LOURENZO, K PVM DAIRY Meal, DOUBLE B
DAIRY/GHC LAC Mineral, WEST PIONT/GHC CLOSEUP Mineral, WEST POINT/GHC LACT Meal,
JENKS, J/COMPASS PROTEIN Meal, COPPINI - 8# SPECIAL DAIRY Mix, GULICK, L-LACT
Meal (Bulk), TRIPLE J - PROTEIN/LACTATION, ROCK CREEK/GHC MILK Mineral,
BETTENCOURT/GHC S.SIDE MK-MN, BETTENCOURT #1/GHC MILK MINR, V&C DAIRY/GHC
LACT Meal, VEENSTRA, F/GHC LACT Meal, SMUTNY, A- BYPASS ML W/SMARTA, Recall #
V-025-2007
CODE
The firm does not utilize a code - only shipping documentation with
commodity and weights identified.
RECALLING FIRM/MANUFACTURER
Rangen, Inc, Buhl, ID, by letters on February 13 and 14, 2007. Firm
initiated recall is complete.
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
16 years post mad cow feed ban August 1997
2013
Sunday, December 15, 2013
FDA PART 589 -- SUBSTANCES PROHIBITED FROM USE IN ANIMAL FOOD OR FEED
VIOLATIONS OFFICIAL ACTION INDICATED OIA UPDATE DECEMBER 2013 UPDATE
17 years post mad cow feed ban August 1997
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
Sunday, June 14, 2015
Larry’s Custom Meats Inc. Recalls Beef Tongue Products That May Contain
Specified Risk Materials BSE TSE Prion
DR. DEHAVEN:
snip...
*** 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
What irks many scientists is the USDA?s April 25 statement that the rare
disease is ?not generally associated with an animal consuming infected
feed.?
The USDA?s conclusion is a ?gross oversimplification,? said Dr. Paul Brown,
one of the world?s experts on this type of disease who retired recently from the
National Institutes of Health.
"(The agency) has no foundation on which to base that statement.?
?We can?t say it?s not feed related,? agreed Dr. Linda Detwiler, an
official with the USDA during the Clinton Administration now at Mississippi
State.
In the May 1 email to me, USDA?s Cole backed off a bit. ?No one knows the
origins of atypical cases of BSE,? she said
Few scientists would argue that the one California cow which never was
headed to the U.S. food supply represents a health hazard.
But many maintain that the current surveillance is insufficient.
Dr. Kurt Giles, an expert in neurogenerative diseases now at the University
of California, San Francisco, was at Oxford during the British outbreak.
He told me USDA?s assurances about safety today remind him of British
statements during the 1980s.
?It is so reminiscent of that absolute certainty,? he said.
Robert Bazell is NBC's chief science and medical correspondent. Follow him
on Facebook and on Twitter @RobertBazellNBC
http://www.nature.com/nature/report/index.html?comment=42931&doi=10.1038/485279b
http://bseusa.blogspot.com/2012/05/are-usda-assurances-on-mad-cow-case.html
THE USDA JUNE 2004 ENHANCED BSE SURVEILLANCE PROGRAM WAS TERRIBLY FLAWED ;
CDC DR. PAUL BROWN TSE EXPERT COMMENTS 2006
In an article today for United Press International, science reporter Steve
Mitchell writes:
Analysis: What that mad cow means
By STEVE MITCHELL UPI Senior Medical Correspondent
WASHINGTON, March 15 (UPI) -- The U.S. Department of Agriculture was quick
to assure the public earlier this week that the third case of mad cow disease
did not pose a risk to them, but what federal officials have not acknowledged is
that this latest case indicates the deadly disease has been circulating in U.S.
herds for at least a decade.
The second case, which was detected last year in a Texas cow and which USDA
officials were reluctant to verify, was approximately 12 years old.
These two cases (the latest was detected in an Alabama cow) present a
picture of the disease having been here for 10 years or so, since it is thought
that cows usually contract the disease from contaminated feed they consume as
calves. The concern is that humans can contract a fatal, incurable,
brain-wasting illness from consuming beef products contaminated with the mad cow
pathogen.
"The fact the Texas cow showed up fairly clearly implied the existence of
other undetected cases," Dr. Paul Brown, former medical director of the National
Institutes of Health's Laboratory for Central Nervous System Studies and an
expert on mad cow-like diseases, told United Press International. "The question
was, 'How many?' and we still can't answer that."
Brown, who is preparing a scientific paper based on the latest two mad cow
cases to estimate the maximum number of infected cows that occurred in the
United States, said he has "absolutely no confidence in USDA tests before one
year ago" because of the agency's reluctance to retest the Texas cow that
initially tested positive.
USDA officials finally retested the cow and confirmed it was infected seven
months later, but only at the insistence of the agency's inspector
general.
"Everything they did on the Texas cow makes everything they did before 2005
suspect," Brown said.
SNIP...
UPI requested detailed records about animals tested under the USDA's
surveillance plan via the Freedom of Information Act in May 2004 but nearly two
years later has not received any corresponding documents from the agency,
despite a federal law requiring agencies to comply within 30 days. This leaves
open the question of whether the USDA is withholding the information, does not
have the information or is so haphazardly organized that it cannot locate
it.
SNIP...
Markus Moser, a molecular biologist and chief executive officer of
Prionics, a Swiss firm that manufactures BSE test kits, told UPI one concern is
that if people are infected, the mad cow pathogen could become "humanized" or
more easily transmitted from person to person.
"Transmission would be much easier, through all kinds of medical
procedures" and even through the blood supply, Moser said.
© Copyright 2006 United Press International, Inc. All Rights Reserved
CDC - Bovine Spongiform Encephalopathy and Variant Creutzfeldt ... Dr. Paul
Brown is Senior Research Scientist in the Laboratory of Central Nervous System
... Address for correspondence: Paul Brown, Building 36, Room 4A-05, ...
PAUL BROWN COMMENT TO ME ON THIS ISSUE
Tuesday, September 12, 2006 11:10 AM
"Actually, Terry, I have been critical of the USDA handling of the mad cow
issue for some years, and with Linda Detwiler and others sent lengthy detailed
critiques and recommendations to both the USDA and the Canadian Food Agency."
........TSS
OR, what the Honorable Phyllis Fong of the OIG found ;
Audit Report Animal and Plant Health Inspection Service Bovine Spongiform
Encephalopathy (BSE) Surveillance Program  Phase II and Food Safety and
Inspection Service
Controls Over BSE Sampling, Specified Risk Materials, and Advanced Meat
Recovery Products - Phase III
Report No. 50601-10-KC January 2006
Finding 2 Inherent Challenges in Identifying and Testing High-Risk Cattle
Still Remain
FRANCE HAVE AN EPIDEMIC OF SPONTANEOUS ATYPICAL BSE ‘’LOL’’
spontaneous atypical BSE ???
if that's the case, then France is having one hell of an epidemic of
atypical BSE, probably why they stopped testing for BSE, problem solved $$$
As of December 2011, around 60 atypical BSE cases have currently been
reported in 13 countries, *** with over one third in France.
so 20 cases of atypical BSE in France, compared to the remaining 40 cases
in the remaining 12 Countries, divided by the remaining 12 Countries, about 3+
cases per country, besides Frances 20 cases. you cannot explain this away with
any spontaneous BSe. ...TSS
Sunday, October 5, 2014
France stops BSE testing for Mad Cow Disease
spontaneous TSE prion, that's wishful thinking. on the other hand, if
spontaneous did ever happen (never once documented in the field), it would be
our worst nightmare, due to feed. just saying.
*** We describe the transmission of spongiform encephalopathy in a
non-human primate inoculated 10 years earlier with a strain of sheep c-scrapie.
Because of this extended incubation period in a facility in which other prion
diseases are under study, we are obliged to consider two alternative
possibilities that might explain its occurrence. We first considered the
possibility of a sporadic origin (like CJD in humans). Such an event is
extremely improbable because the inoculated animal was 14 years old when the
clinical signs appeared, i.e. about 40% through the expected natural lifetime of
this species, compared to a peak age incidence of 60–65 years in human sporadic
CJD, or about 80% through their expected lifetimes.
***Moreover, sporadic disease has never been observed in breeding colonies
or primate research laboratories, most notably among hundreds of animals over
several decades of study at the National Institutes of Health25, and in nearly
twenty older animals continuously housed in our own facility.***
>>> Moreover, sporadic disease has never been observed in breeding
colonies or primate research laboratories, most notably among hundreds of
animals over several decades of study at the National Institutes of Health25,
and in nearly twenty older animals continuously housed in our own facility.
<<<
Monday, June 23, 2014
PRION 2014 TYPICAL AND ATYPICAL BSE AND CJD REPORT UPDATES
***P.170: Potential detection of oral transmission of H type atypical BSE
in cattle using in vitro conversion
Sandor Dudas, John G Gray, Renee Clark, and Stefanie Czub Canadian Food
Inspection Agency; Lethbridge, AB Canada
Keywords: Atypical BSE, oral transmission, RT-QuIC
The detection of bovine spongiform encephalopathy (BSE) has had a
significant negative impact on the cattle industry worldwide. In response,
governments took actions to prevent transmission and additional threats to
animal health and food safety. While these measures seem to be effective for
controlling classical BSE, the more recently discovered atypical BSE has
presented a new challenge. To generate data for risk assessment and control
measures, we have challenged cattle orally with atypical BSE to determine
transmissibility and mis-folded prion (PrPSc) tissue distribution. Upon
presentation of clinical symptoms, animals were euthanized and tested for
characteristic histopathological changes as well as PrPSc deposition.
The H-type challenged animal displayed vacuolation exclusively in rostral
brain areas but the L-type challenged animal showed no evidence thereof. To our
surprise, neither of the animals euthanized, which were displaying clinical
signs indicative of BSE, showed conclusive mis-folded prion accumulation in the
brain or gut using standard molecular or immunohistochemical assays. To confirm
presence or absence of prion infectivity, we employed an optimized real-time
quaking induced conversion (RT-QuIC) assay developed at the Rocky Mountain
Laboratory, Hamilton, USA.
Detection of PrPSc was unsuccessful for brain samples tests from the orally
inoculated L type animal using the RT-QuIC. It is possible that these negative
results were related to the tissue sampling locations or that type specific
optimization is needed to detect PrPSc in this animal. We were however able to
consistently detect the presence of mis-folded prions in the brain of the H-type
inoculated animal. Considering the negative and inconclusive results with other
PrPSc detection methods, positive results using the optimized RT-QuIC suggests
the method is extremely sensitive for H-type BSE detection. This may be evidence
of the first successful oral transmission of H type atypical BSE in cattle and
additional investigation of samples from these animals are ongoing.
P.126: Successful transmission of chronic wasting disease (CWD) into mice
over-expressing bovine prion protein (TgSB3985)
Larisa Cervenakova,1 Christina J Sigurdson,2 Pedro Piccardo,3 Oksana
Yakovleva,1 Irina Vasilyeva,1 Jorge de Castro,1 Paula Saá,1 and Anton Cervenak1
1American Red Cross, Holland Laboratory; Rockville, MD USA; 2University of
California; San Diego, CA USA; 3Lab TSE/OBRR /CBER/FDA; Rockville, MD USA
Keywords: chronic wasting disease, transmission, transgenic mouse, bovine
prion protein
Background. CWD is a disease affecting wild and farmraised cervids in North
America. Epidemiological studies provide no evidence of CWD transmission to
humans. Multiple attempts have failed to infect transgenic mice expressing human
PRNP gene with CWD. The extremely low efficiency of PrPCWD to convert normal
human PrPC in vitro provides additional evidence that transmission of CWD to
humans cannot be easily achieved. However, a concern about the risk of CWD
transmission to humans still exists. This study aimed to establish and
characterize an experimental model of CWD in TgSB3985 mice with the following
attempt of transmission to TgHu mice.
Materials and Methods. TgSB3985 mice and wild-type FVB/ NCrl mice were
intracranially injected with 1% brain homogenate from a CWD-infected Tga20 mouse
(CWD/Tga20). TgSB3985 and TgRM (over-expressing human PrP) were similarly
injected with 5% brain homogenates from CWD-infected white-tailed deer (CWD/WTD)
or elk (CWD/Elk). Animals were observed for clinical signs of neurological
disease and were euthanized when moribund. Brains and spleens were removed from
all mice for PrPCWD detection by Western blotting (WB). A histological analysis
of brains from selected animals was performed: brains were scored for the
severity of spongiform change, astrogliosis, and PrPCWD deposition in ten brain
regions.
Results. Clinical presentation was consistent with TSE. More than 90% of
TgSB3985 and wild-type mice infected with CWD/Tga20, tested positive for PrPres
in the brain but only mice in the latter group carried PrPCWD in their spleens.
We found evidence for co-existence or divergence of two CWD/ Tga20 strains based
on biochemical and histological profiles. In TgSB3985 mice infected with CWD-elk
or CWD-WTD, no animals tested positive for PrPCWD in the brain or in the spleen
by WB. However, on neuropathological examination we found presence of amyloid
plaques that stained positive for PrPCWD in three CWD/WTD- and two
CWD/Elk-infected TgSB3985 mice. The neuropathologic profiles in CWD/WTD- and
CWD/Elkinfected mice were similar but unique as compared to profiles of BSE,
BSE-H or CWD/Tg20 agents propagated in TgSB3985 mice. None of CWD-infected TgRM
mice tested positive for PrPCWD by WB or by immunohistochemical detection.
Conclusions. To our knowledge, this is the first established experimental
model of CWD in TgSB3985. We found evidence for co-existence or divergence of
two CWD strains adapted to Tga20 mice and their replication in TgSB3985 mice.
Finally, we observed phenotypic differences between cervid-derived CWD and
CWD/Tg20 strains upon propagation in TgSB3985 mice. Further studies are underway
to characterize these strains.
P.150: Zoonotic potential of L-type BSE prions: A new prion disease in
humans?
Emilie Jaumain,1 Stéphane Haïk,2 Isabelle Quadrio,3 Laetitia Herzog,1
Fabienne Reine,1 Armand Perret-Liaudet,3 Human Rezaei,1 Hubert Laude,1 Jean-Luc
Vilotte,4 and Vincent Béringue1 1INR A (Institut National de la Recherche
Agronomique); UR892; Virologie Immunologie Moléculaires; Jouy-en-Josas, France;
2IN SERM; Equipe maladie d’Alzheimer et maladies à Prions; CRicm; UMRS 1127; CNR
S; UPMC. R.; ICM, Hôpital de la Salpêtrière; Paris, France; 3Neurobiologie, CMRR
, Gériatrie, Hospices Civils de Lyon, Université Lyon 1-CNR S UMR5292-IN SERM
U1028; Lyon, France; 3INR A; UMR1313; Génétique Animale et Biologie Intégrative;
Jouy-en-Josas, France
In summary, L-type prions can be passaged on the human PrP sequence without
any obvious transmission barrier. The phenotype obtained differs from the
classical CJD prion types known so far. Careful extrapolation would suggest that
the zoonotic transmission of this agent could establish a new prion disease type
in humans.
Wednesday, May 30, 2012
PO-028: Oral transmission of L-type bovine spongiform encephalopathy
(L-BSE) in primate model Microcebus murinus
Nadine Mestre-Frances,1 Simon Nicot,2 Sylvie Rouland,1 Anne-Gaëlle
Biacabe,2 Isabelle Quadrio,3 Armand Perret-Liaudet,3 Thierry Baron,2 Jean-Michel
Verdier1
1IN SER M UM2; Montpellier, France; 2Anses; Lyon, France; 3Hopitaux Civils
de Lyon; Lyon, France
Here, we demonstrate that the L-BSE agent can be transmitted by oral route
from cattle to young and adult mouse lemurs. In comparison to IC inoculated
animals, orally challenged lemurs were characterized by longer survival periods
as expected with this route of infection.
Australia
COMMONWEALTH OF AUSTRALIA Official Committee Hansard SENATE RURAL AND
REGIONAL AFFAIRS AND TRANSPORT REFERENCES COMMITTEE Reference: Import
restrictions on beef FRIDAY, 5 FEBRUARY 2010 CANBERRA BY AUTHORITY OF THE
SENATE
RRA&T 2 Senate Friday, 5 February 2010 RURAL AND REGIONAL AFFAIRS AND
TRANSPORT
[9.03 am]
BELLINGER, Mr Brad, Chairman, Australian Beef Association
CARTER, Mr John Edward, Director, Australian Beef Association
CHAIR—Welcome. Would you like to make an opening statement?
Mr Bellinger—Thank you. The ABA stands by its submission, which we made on
14
December last year, that the decision made by the government to allow the
importation of beef from BSE affected countries is politically based, not
science based. During this hearing we will bring forward compelling new evidence
to back up this statement. When I returned to my property after the December
hearing I received a note from an American citizen. I will read a small excerpt
from the mail he sent me in order to reinforce the dangers of allowing the
importation of beef from BSE affected countries. I have done a number of press
releases on this topic, and this fellow has obviously picked my details up from
the internet. His name is Terry Singeltary and he is from Bacliff, Texas. He
states, and rightfully so:
snip...end
*** Singeltary reply ; Molecular, Biochemical and Genetic Characteristics
of BSE in Canada Singeltary reply ;
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.
CJD toll among farmers `too high for mere chance'
August 15, 1997
PA News
John von Radowitz and Andrew Woodcock Microbiologist Richard Lacey, billed
in this story as the first to suggest a link between CJD and BSE seven years
ago, was cited in this story as saying that the number of cattle farmers falling
victim to Creutzfeld-Jakob Disease is much too high to be mere chance, adding
that, "Where the CJD Surveillance Unit come unstuck is in trying to explain what
happened to these six farmers. This is just too many to have occurred by chance.
Unfortunately they don't want to consider the possibility that these farmers in
this country and other countries were infected by cattle before BSE developed."
The story notes that professor Lacey believes sporadic CJD itself originates
from a cattle infection - possibly a precursor to BSE that has not yet been
detected, adding that,
"For years I have suggested that the cause is a rare disease in cattle
world wide. Both BSE and the new variant CJD are a new and different disease.
What has probably happened is that BSE is a variant of the old type of disease,
which could have been missed because it's symptom free. It would explain why
such an unusually high number of dairy farmers are being affected by CJD both
here and abroad." He also said that cases of sporadic CJD had been recorded as
far back as the 1920s. Professor Lacey went on to add that he thought the new
variant pattern was alarming, adding, "It's rising, and that is a concern.
Unfortunately we can't predict the scale of the problem. If the disease doubled
each year up to the year 2020 you'd have hundreds of thousands of cases."
.195 Among occupational groups exposed to BSE, farmers remain unusual in
having such an excess over the incidence of CJD for the population as a whole.
No cases of CJD have been reported amount veterinarians exposed to BSE. Four
people in the meat industry (butchers, abattoirs, rendering plants, etc) have
been reported to have vCJD.386 The present evidence has been accepted by some as
reassuring in that such occupations may not pose as serious a risk as might have
been expected.
This was not simply another farmer but the third farmer...
suspect case of CJD in a farmer who has had a case of BSE in his beef
suckler herd.
http://web.archive.org/web/20030331213802/http://www.bseinquiry.gov.uk/files/yb/1995/10/23006001.pdf
cover-up of 4th farm worker ???
http://web.archive.org/web/20030516083454/http://www.bseinquiry.gov.uk/files/yb/1995/10/23006001.pdf
http://web.archive.org/web/20030330175323/http://www.bseinquiry.gov.uk/files/yb/1995/10/20006001.pdf
CONFIRMATION OF CJD IN FOURTH FARMER
now story changes from; SEAC concluded that, if the fourth case were
confirmed, it would be worrying, especially as all four farmers with CJD would
have had BSE cases on their farms.
to;
This is not unexpected... was another farmer expected?
http://web.archive.org/web/20030728074919/http://www.bseinquiry.gov.uk/files/yb/1995/11/13010001.pdf
4th farmer, and 1st teenager
snip...
2. Over a 5 year period, which is the time period on which the advice from
Professor Smith and Dr. Gore was based, and assuming a population of 120,000
dairy farm workers, and an annual incidence of 1 per million cases of CJD in the
general population, a DAIRY FARM WORKER IS 5 TIMES MORE LIKELY THAN an
individual in the general population to develop CJD. Using the actual current
annual incidence of CJD in the UK of 0.7 per million, this figure becomes 7.5
TIMES.
3. You will recall that the advice provided by Professor Smith in 1993 and
by Dr. Gore this month used the sub-population of dairy farm workers who had had
a case of BSE on their farms - 63,000, which is approximately half the number of
dairy farm workers - as a denominator. If the above sums are repeated using this
denominator population, taking an annual incidence in the general population of
1 per million the observed rate in this sub-population is 10 TIMES, and taking
an annual incidence of 0.7 per million, IT IS 15 TIMES (THE ''WORST CASE''
SCENARIO) than that in the general population...
http://web.archive.org/web/20030516181226/http://www.bseinquiry.gov.uk/files/yb/1995/01/31004001.pdf
CJD FARMERS WIFE 1989
20 year old died from sCJD in USA in 1980 and a 16 year old in 1981. A 19
year old died from sCJD in France in 1985. There is no evidence of an iatrogenic
cause for those cases....
http://web.archive.org/web/20030330212925/http://www.bseinquiry.gov.uk/files/yb/1995/10/04004001.pdf
Monday, May 19, 2008
SPORADIC CJD IN FARMERS, FARMERS WIVES, FROM FARMS WITH BSE HERD AND
ABATTOIRS
Monday, June 29, 2015
*** RESTRICTED – POLICY CJD IN ADOLESCENTS (16 year old Vickey Rimmer),
FARMERS WITH BSE HERDS, AND FARMERS WIFE with Sporadic CJD
PRION 2015 CONFERENCE FT. COLLINS CWD RISK FACTORS TO HUMANS
*** LATE-BREAKING ABSTRACTS PRION 2015 CONFERENCE ***
O18
Zoonotic Potential of CWD Prions
Liuting Qing1, Ignazio Cali1,2, Jue Yuan1, Shenghai Huang3, Diane Kofskey1,
Pierluigi Gambetti1, Wenquan Zou1, Qingzhong Kong1 1Case Western Reserve
University, Cleveland, Ohio, USA, 2Second University of Naples, Naples, Italy,
3Encore Health Resources, Houston, Texas, USA
Chronic wasting disease (CWD) is a widespread and expanding prion disease
in free-ranging and captive cervid species in North America. The zoonotic
potential of CWD prions is a serious public health concern. Current literature
generated with in vitro methods and in vivo animal models (transgenic mice,
macaques and squirrel monkeys) reports conflicting results. The susceptibility
of human CNS and peripheral organs to CWD prions remains largely unresolved. In
our earlier bioassay experiments using several humanized transgenic mouse lines,
we detected protease-resistant PrPSc in the spleen of two out of 140 mice that
were intracerebrally inoculated with natural CWD isolates, but PrPSc was not
detected in the brain of the same mice. Secondary passages with such
PrPSc-positive CWD-inoculated humanized mouse spleen tissues led to efficient
prion transmission with clear clinical and pathological signs in both humanized
and cervidized transgenic mice. Furthermore, a recent bioassay with natural CWD
isolates in a new humanized transgenic mouse line led to clinical prion
infection in 2 out of 20 mice. These results indicate that the CWD prion has the
potential to infect human CNS and peripheral lymphoid tissues and that there
might be asymptomatic human carriers of CWD infection.
==================
***These results indicate that the CWD prion has the potential to infect
human CNS and peripheral lymphoid tissues and that there might be asymptomatic
human carriers of CWD infection.***
==================
P.105: RT-QuIC models trans-species prion transmission
Kristen Davenport, Davin Henderson, Candace Mathiason, and Edward Hoover
Prion Research Center; Colorado State University; Fort Collins, CO USA
The propensity for trans-species prion transmission is related to the
structural characteristics of the enciphering and heterologous PrP, but the
exact mechanism remains mostly mysterious. Studies of the effects of primary or
tertiary prion protein structures on trans-species prion transmission have
relied primarily upon animal bioassays, making the influence of prion protein
structure vs. host co-factors (e.g. cellular constituents, trafficking, and
innate immune interactions) difficult to dissect. As an alternative strategy, we
used real-time quakinginduced conversion (RT-QuIC) to investigate trans-species
prion conversion.
To assess trans-species conversion in the RT-QuIC system, we compared
chronic wasting disease (CWD) and bovine spongiform encephalopathy (BSE) prions,
as well as feline CWD (fCWD) and feline spongiform encephalopathy (FSE). Each
prion was seeded into each host recombinant PrP (full-length rPrP of
white-tailed deer, bovine or feline). We demonstrated that fCWD is a more
efficient seed for feline rPrP than for white-tailed deer rPrP, which suggests
adaptation to the new host.
Conversely, FSE maintained sufficient BSE characteristics to more
efficiently convert bovine rPrP than feline rPrP. Additionally, human rPrP was
competent for conversion by CWD and fCWD. ***This insinuates that, at the level
of protein:protein interactions, the barrier preventing transmission of CWD to
humans is less robust than previously estimated.
================
***This insinuates that, at the level of protein:protein interactions, the
barrier preventing transmission of CWD to humans is less robust than previously
estimated.***
================
***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.
From: Terry S. Singeltary Sr.
Sent: Saturday, November 15, 2014 9:29 PM
To: Terry S. Singeltary Sr.
Subject: THE EPIDEMIOLOGY OF CREUTZFELDT-JAKOB DISEASE R. G. WILL
1984
THE EPIDEMIOLOGY OF CREUTZFELDT-JAKOB DISEASE
R. G. WILL
1984
*** The association between venison eating and risk of CJD shows similar
pattern, with regular venison eating associated with a 9 FOLD INCREASE IN RISK
OF CJD (p = 0.04). (SEE LINK IN REPORT HERE...TSS) PLUS, THE CDC DID NOT PUT
THIS WARNING OUT FOR THE WELL BEING OF THE DEER AND ELK ;
snip...
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...
In Confidence - Perceptions of unconventional slow virus diseases of
animals in the USA - APRIL-MAY 1989 - G A H Wells
3. Prof. A. Robertson gave a brief account of BSE. The US approach was to
accord it a very low profile indeed. Dr. A Thiermann showed the picture in the
''Independent'' with cattle being incinerated and thought this was a fanatical
incident to be avoided in the US at all costs. ...
Thursday, September 10, 2015
25th Meeting of the Transmissible Spongiform Encephalopathies Advisory
Committee Food and Drug Administration Silver Spring, Maryland June 1, 2015
Tuesday, August 4, 2015
FDA U.S. Measures to Protect Against BSE
Monday, August 17, 2015
FDA Says Endoscope Makers Failed to Report Superbug Problems OLYMPUS
I told Olympus 15 years ago about these risk factors from endoscopy
equipment, disinfection, even spoke with the Doctor at Olympus, this was back in
1999. I tried to tell them that they were exposing patients to dangerous
pathogens such as the CJD TSE prion, because they could not properly clean them.
even presented my concern to a peer review journal GUT, that was going to
publish, but then it was pulled by Professor Michael Farthing et al... see ;
Alzheimer's, iatrogenic, transmissible, tse, prion, what if ?
Wednesday, September 9, 2015
Evidence for human transmission of amyloid-β pathology and cerebral amyloid
angiopathy
Wednesday, September 2, 2015
Clinically Unsuspected Prion Disease Among Patients With Dementia Diagnoses
in an Alzheimer’s Disease Database
Tuesday, September 1, 2015
Evidence for α-synuclein prions causing multiple system atrophy in humans
with parkinsonism
*** Creutzfeldt-Jakob Disease *** Public Health Crisis VIDEO
Diagnosis and Reporting of Creutzfeldt-Jakob Disease
Singeltary, Sr et al. JAMA.2001; 285: 733-734. Vol. 285 No. 6, February 14,
2001 JAMA
Diagnosis and Reporting of Creutzfeldt-Jakob Disease
To the Editor: In their Research Letter, Dr Gibbons and colleagues1
reported that the annual US death rate due to Creutzfeldt-Jakob disease (CJD)
has been stable since 1985. These estimates, however, are based only on reported
cases, and do not include misdiagnosed or preclinical cases. It seems to me that
misdiagnosis alone would drastically change these figures. An unknown number of
persons with a diagnosis of Alzheimer disease in fact may have CJD, although
only a small number of these patients receive the postmortem examination
necessary to make this diagnosis. Furthermore, only a few states have made CJD
reportable. Human and animal transmissible spongiform encephalopathies should be
reportable nationwide and internationally.
Terry S. Singeltary, Sr Bacliff, Tex
1. Gibbons RV, Holman RC, Belay ED, Schonberger LB. Creutzfeldt-Jakob
disease in the United States: 1979-1998. JAMA. 2000;284:2322-2323.
Singeltary publishing’s ...
kind regards, terry
Terry S. Singeltary Sr.
Texas Galveston Bay, on the bottom....
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