Docket No. 00-108-10 Deer Comm, SETWS CWD TSE PRION comment submission March 12 2014
Docket No. 00-108-10 Deer Comm, SETWS CWD TSE PRION comment submission
March 12 2014
12 March 2013 Docket No. 00-108-10 Regulatory Analysis and Development PPD,
APHIS Station 3A-03.8 4700 River Road Unit 118 Riverdale, MD 20737-1238
Dear Sir/Madam:
The Deer Committee, Southeast Section of The Wildlife Society represents
wildlife biologists within the southeastern states, in addition to Maryland,
Delaware, Missouri and Texas. This committee does not support implementation of
the Program Standards as written because they will not minimize the rate of
Chronic Wasting Disease (CWD).
We have particular concern over the suggestion that states consider
allowing movement of animals that are CWD-positive, CWD-suspect, or CWD–exposed
from infected facilities for any reason, including to “shooter pens.”
Additionally, allowing the introduction of additional animals into CWD-positive,
CWD-suspect and CWD-exposed herds would increase the number of potentially
infected animals on the landscape and thus increase the risk of spread. Of
greatest concern is allowing movement of live animals from CWD-positive,
CWD-suspect and CWD-exposed herds through other states, especially those which
do not allow cervid farming and those that are currently CWD negative. Such
recommendations are in direct conflict with APHIS’s stated goal of minimizing
the risk of spreading CWD.
The Standards note in (4) Fencing that double-fencing might be desirable
even though double fencing is not intend “as a comprehensive program standard”.
We appreciate this nod to the reality that nose-to-nose contact occurs and
increases the risk of spread. In that same spirit, the Standards should
recommend only using semen from males in 5-yr certified herds until the true
risk from semen and artificial/assisted reproduction can be assessed. Every
tissue and body fluid examined for the presence of infectious prions has proven
to have them (muscle, blood, urine, and saliva), so efforts to control CWD
should assume all tissues and fluids pose similar risk, including semen and
eggs. Furthermore, research has demonstrated that similar diseases (scrapie and
bovine TSE) can be transmitted via semen and/or artificial insemination
procedures (Rubenstein et al. 2012 Journal of General Virology; Wrathall et al.
2008 Theriogenology), Though not required by the Rule, the Standards should
recommend that escape of captive deer into the wild and ingress of wild deer
into a fenced facility should be reported to the State wildlife agency
regardless of jurisdictional involvement with farmed cervids. The State wildlife
agency has jurisdiction over any wild deer that get into a facility, and would
have to deal with unrecovered escapes
Docket No. 00-108-10 Deer Comm, SETWS
continued
commingling with wild cervids. Furthermore, the State wildlife agency has
resources and abilities to address both situations, in contrast to State
agriculture/animal health agencies.
Given that the Standards are intended to provide “optional guidelines on
best management practices… to manage CWD-affected herds”, the Standards should
strongly recommend all clinical CWD suspects be tested regardless of age. Given
that the Program Standards are optional, they should include all alternatives
that would minimize the risk of disease dissemination. As written these
standards do more to insure “continuity of business” for the captive cervid
industry than they do for controlling the current serious disease problem. The
supposed potential economic value of the captive cervid industry is dwarfed by
the $18.1 billion of economic impact (National Shooting Sports Foundation. 2013
Hunting’s Economic Impact) related to our wild deer resource.
The Deer Committee of the Southeast Section of The Wildlife Society most
strongly requests that these Program Standards be rejected as written and that
revised standards include language that will insure minimizing the dangers posed
to our wild deer populations across the United States.
Sincerely,
Steve Demarais, Chair Deer Committee, SE
Singeltary submission ;
Program Standards: Chronic Wasting Disease Herd Certification Program and
Interstate Movement of Farmed or Captive Deer, Elk, and Moose
*** DOCUMENT ID: APHIS-2006-0118-0411
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Reject the proposed rules. They increase the risk of
CWD, facilitate perpetuation of CWD in captive-cervid herds and the environment,
and increase the risk of...” 
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Submitter Name: Caywood, John
Posted: 03/17/2014
ID: APHIS-2006-0118-0413
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See attached file(s)”
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Submitter Name: Demarais, Stephen
Posted: 03/17/2014
ID: APHIS-2006-0118-0412
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Docket No. 00-108-10 Chronic Wasting Disease Herd
Certification Program and Interstate Movement of Farmed or Captive Deer, Elk,
and Moose; Program Standards...”
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Submitter Name: Singeltary, Terry
Posted: 03/11/2014
ID: APHIS-2006-0118-0411
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All deer and elk farms should be ban and made illegal
throughout the U.S. Deer and elf farms are the sole reason CWD is so ramped
throughout this country. Get...”
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Submitter Name: Gregory, James
Posted: 03/10/2014
ID: APHIS-2006-0118-0410
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The Wisconsin Department of Natural Resources (WI-DNR)
has taken this so called Chronic Wasting Disease (CWD) and turned it into one
big circus. CWD has been...”
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Submitter Name: Wurz, Greg
Posted: 03/10/2014
ID: APHIS-2006-0118-0409
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how many states have $465,000., and can quarantine and purchase there from,
each cwd said infected farm, but how many states can afford this for all the cwd
infected cervid game ranch type farms ???
Tuesday, December 20, 2011
CHRONIC WASTING DISEASE CWD WISCONSIN Almond Deer (Buckhorn Flats) Farm
Update DECEMBER 2011
The CWD infection rate was nearly 80%, the highest ever in a North American
captive herd.
RECOMMENDATION: That the Board approve the purchase of 80 acres of land for
$465,000 for the Statewide Wildlife Habitat Program in Portage County and
approve the restrictions on public use of the site.
SUMMARY:
Wednesday, September 04, 2013
*** cwd - cervid captive livestock escapes, loose and on the run in the
wild
Tuesday, February 11, 2014
Wisconsin tracks 81 deer from game farm with CWD buck to seven other states
Friday, March 07, 2014
37th Annual Southeast Deer Study Group Meeting in Athens, Georgia (CWD TSE
Prion abstracts)
Tuesday, February 25, 2014
*** Test results provide current snapshot of CWD in south-central Wisconsin
Dane and Eastern Iowa counties Prevalence has increased in all categories
Sunday, March 09, 2014
ACA Council Reviews Comment Period Procedure, Border Closings, Iowa Legal
Case, & Committee Recommendations
$$$
Monday, March 03, 2014
APHIS to Offer Indemnity for CWD Positive Herds as Part of Its Cervid
Health Activities ???
----- Original Message -----
From: David Colby
To: flounder9@verizon.net
Cc: stanley@XXXXXXXX
Sent: Tuesday, March 01, 2011 8:25 AM
Subject: Re: FW: re-Prions David W. Colby1,* and Stanley B. Prusiner1,2 +
Author Affiliations
Dear Terry Singeltary,
Thank you for your correspondence regarding the review article Stanley
Prusiner and I recently wrote for Cold Spring Harbor Perspectives. Dr. Prusiner
asked that I reply to your message due to his busy schedule. We agree that the
transmission of CWD prions to beef livestock would be a troubling development
and assessing that risk is important. In our article, we cite a peer-reviewed
publication reporting confirmed cases of laboratory transmission based on
stringent criteria. The less stringent criteria for transmission described in
the abstract you refer to lead to the discrepancy between your numbers and ours
and thus the interpretation of the transmission rate. We stand by our assessment
of the literature--namely that the transmission rate of CWD to bovines appears
relatively low, but we recognize that even a low transmission rate could have
important implications for public health and we thank you for bringing attention
to this matter.
UPDATED DATA ON 2ND CWD STRAIN
Wednesday, September 08, 2010
CWD PRION CONGRESS SEPTEMBER 8-11 2010
Thursday, November 21, 2013
*** Assessing the susceptibility of transgenic mice over-expressing deer
prion protein to bovine spongiform encephalopathy
The present study was designed to assess the susceptibility of the
prototypic mouse line, Tg(CerPrP)1536+/- to bovine spongiform encephalopathy
(BSE) prions, which have the ability to overcome species barriers.
Tg(CerPrP)1536+/- mice challenged with red deer-adapted BSE resulted in a
90-100% attack rates, BSE from cattle failed to transmit, indicating agent
adaptation in the deer.
2012
PO-039: A comparison of scrapie and chronic wasting disease in white-tailed
deer
snip...
After a natural route of exposure, 100% of WTD were susceptible to scrapie.
...This work demonstrates that WTD are highly susceptible to sheep scrapie, but
on first passage, scrapie in WTD is differentiable from CWD.
2011
*** After a natural route of exposure, 100% of white-tailed deer were
susceptible to scrapie.
Research Project: Virus and Prion Research Unit 2011 Annual Report
In Objective 1, Assess cross-species transmissibility of transmissible
spongiform encephalopathies (TSEs) in livestock and wildlife, numerous
experiments assessing the susceptibility of various TSEs in different host
species were conducted.
Most notable is deer inoculated with scrapie, which exhibits similarities
to chronic wasting disease (CWD) in deer suggestive of sheep scrapie as an
origin of CWD.
This work conducted by ARS scientists at the National Animal Disease
Center, Ames, IA suggests that an interspecies transmission of sheep scrapie to
deer may have been the origin of CWD. This is important for husbandry practices
with both captive deer, elk and sheep for farmers and ranchers attempting to
keep their herds and flocks free of CWD and scrapie.
White-tailed Deer are Susceptible to Scrapie by Natural Route of Infection
snip...
This work demonstrates for the first time that white-tailed deer are
susceptible to sheep scrapie by potential natural routes of inoculation.
In-depth analysis of tissues will be done to determine similarities between
scrapie in deer after intracranial and oral/intranasal inoculation and chronic
wasting disease resulting from similar routes of inoculation.
see full text ;
> Although the limited data from this ongoing study must be considered
preliminary, they raise the potential for cervid-to-feline transmission in
nature.
Monday, August 8, 2011 Susceptibility of Domestic Cats to CWD Infection
Oral.29: Susceptibility of Domestic Cats to CWD Infection
Amy Nalls, Nicholas J. Haley, Jeanette Hayes-Klug, Kelly Anderson, Davis M.
Seelig, Dan S. Bucy, Susan L. Kraft, Edward A. Hoover and Candace K.
Mathiason†
Colorado State University; Fort Collins, CO USA†Presenting author; Email:
ckm@lamar.colostate.edu
Domestic and non-domestic cats have been shown to be susceptible to one
prion disease, feline spongiform encephalopathy (FSE), thought to be transmitted
through consumption of bovine spongiform encephalopathy (BSE) contaminated meat.
Because domestic and free ranging felids scavenge cervid carcasses, including
those in CWD affected areas, we evaluated the susceptibility of domestic cats to
CWD infection experimentally. Groups of n = 5 cats each were inoculated either
intracerebrally (IC) or orally (PO) with CWD deer brain homogenate. Between
40–43 months following IC inoculation, two cats developed mild but progressive
symptoms including weight loss, anorexia, polydipsia, patterned motor behaviors
and ataxia—ultimately mandating euthanasia. Magnetic resonance imaging (MRI) on
the brain of one of these animals (vs. two age-matched controls) performed just
before euthanasia revealed increased ventricular system volume, more prominent
sulci, and T2 hyperintensity deep in the white matter of the frontal hemisphere
and in cortical grey distributed through the brain, likely representing
inflammation or gliosis. PrPRES and widely distributed peri-neuronal vacuoles
were demonstrated in the brains of both animals by immunodetection assays. No
clinical signs of TSE have been detected in the remaining primary passage cats
after 80 months pi. Feline-adapted CWD was sub-passaged into groups (n=4 or 5)
of cats by IC, PO, and IP/SQ routes. Currently, at 22 months pi, all five IC
inoculated cats are demonstrating abnormal behavior including increasing
aggressiveness, pacing, and hyper responsiveness.
*** Two of these cats have developed rear limb ataxia. Although the limited
data from this ongoing study must be considered preliminary, they raise the
potential for cervid-to-feline transmission in nature.
Sunday, March 09, 2014
Lesion Profiling and Subcellular Prion Localization of Cervid Chronic
Wasting Disease in Domestic Cats
see Lechins ;
Saturday, March 15, 2014
*** Potential role of soil properties in the spread of CWD in western
Canada ***
*** 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. ...
also, see where even decades back, the USDA had the same thought as they do
today with CWD, not their problem...see page 27 below as well, where USDA stated
back then, the same thing they stated in the state of Pennsylvania, not their
damn business, once they escape, and they said the same thing about CWD in
general back then ;
”The occurrence of CWD must be viewed against the contest of the locations
in which it occurred. It was an incidental and unwelcome complication of the
respective wildlife research programmes. Despite it’s subsequent recognition as
a new disease of cervids, therefore justifying direct investigation, no specific
research funding was forthcoming. The USDA veiwed it as a wildlife problem and
consequently not their province!” ...page 26.
”The occurrence of CWD must be viewed against the contest of the locations
in which it occurred. It was an incidental and unwelcome complication of the
respective wildlife research programmes. Despite it’s subsequent recognition as
a new disease of cervids, therefore justifying direct investigation, no specific
research funding was forthcoming. The USDA veiwed it as a wildlife problem and
consequently not their province!” ...page 26.
sound familiar $$$
Sunday, January 06, 2013
USDA TO PGC ONCE CAPTIVES ESCAPE
*** "it‘s no longer its business.”
Wednesday, September 04, 2013
*** cwd - cervid captive livestock escapes, loose and on the run in the
wild
============================================================================================================
*** Individuals reported to eat veal on average at least once a year appear
to be at 13 TIMES THE RISK of individuals who have never eaten veal.
*** There is, however, a very wide confidence interval around this
estimate. There is no strong evidence that eating veal less than once per year
is associated with increased risk of CJD (p = 0.51).
*** 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).
*** There is some evidence that risk of CJD INCREASES WITH INCREASING
FREQUENCY OF LAMB EATING (p = 0.02). *** In conclusion, an analysis of dietary
histories revealed statistical associations between various meats/animal
products and INCREASED RISK OF CJD. When some account was taken of possible
confounding, the association between VEAL EATING AND RISK OF CJD EMERGED AS THE
STRONGEST OF THESE ASSOCIATIONS STATISTICALLY. ...
=============================================================================================================
CREUTZFELDT JAKOB DISEASE SURVEILLANCE IN THE UNITED KINGDOM THIRD ANNUAL
REPORT AUGUST 1994
Consumption of venison and veal was much less widespread among both cases
and controls. For both of these meats there was evidence of a trend with
increasing frequency of consumption being associated with increasing risk of
CJD. (not nvCJD, but sporadic CJD...tss) These associations were largely
unchanged when attention was restricted to pairs with data obtained from
relatives. ...
Table 9 presents the results of an analysis of these data.
*** There is STRONG evidence of an association between ‘’regular’’ veal
eating and risk of CJD (p = .0.01).
*** Individuals reported to eat veal on average at least once a year appear
to be at 13 TIMES THE RISK of individuals who have never eaten veal.
There is, however, a very wide confidence interval around this estimate.
There is no strong evidence that eating veal less than once per year is
associated with increased risk of CJD (p = 0.51).
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).
There is some evidence that risk of CJD INCREASES WITH INCREASING FREQUENCY
OF LAMB EATING (p = 0.02).
The evidence for such an association between beef eating and CJD is weaker
(p = 0.14). When only controls for whom a relative was interviewed are included,
this evidence becomes a little STRONGER (p = 0.08).
snip...
It was found that when veal was included in the model with another
exposure, the association between veal and CJD remained statistically
significant (p = < 0.05 for all exposures), while the other exposures ceased
to be statistically significant (p = > 0.05).
snip...
In conclusion, an analysis of dietary histories revealed statistical
associations between various meats/animal products and INCREASED RISK OF CJD.
When some account was taken of possible confounding, the association between
VEAL EATING AND RISK OF CJD EMERGED AS THE STRONGEST OF THESE ASSOCIATIONS
STATISTICALLY. ...
snip...
In the study in the USA, a range of foodstuffs were associated with an
increased risk of CJD, including liver consumption which was associated with an
apparent SIX-FOLD INCREASE IN THE RISK OF CJD. By comparing the data from 3
studies in relation to this particular dietary factor, the risk of liver
consumption became non-significant with an odds ratio of 1.2 (PERSONAL
COMMUNICATION, PROFESSOR A. HOFMAN. ERASMUS UNIVERSITY, ROTTERDAM). (???...TSS)
snip...see full report ;
Thursday, October 10, 2013
*** CJD REPORT 1994 increased risk for consumption of veal and venison and
lamb
PPo3-7:
Prion Transmission from Cervids to Humans is Strain-dependent
Qingzhong Kong, Shenghai Huang,*Fusong Chen, Michael Payne, Pierluigi
Gambetti and Liuting Qing Department of Pathology; Case western Reserve
University; Cleveland, OH USA *Current address: Nursing Informatics; Memorial
Sloan-Kettering Cancer Center; New York, NY USA
Key words: CWD, strain, human transmission
Chronic wasting disease (CWD) is a widespread prion disease in cervids
(deer and elk) in North America where significant human exposure to CWD is
likely and zoonotic transmission of CWD is a concern. Current evidence indicates
a strong barrier for transmission of the classical CWD strain to humans with the
PrP-129MM genotype. A few recent reports suggest the presence of two or more CWD
strains. What remain unknown is whether individuals with the PrP-129VV/MV
genotypes are also resistant to the classical CWD strain and whether humans are
resistant to all natural or adapted cervid prion strains. Here we report that a
human prion strain that had adopted the cervid prion protein (PrP) sequence
through passage in cervidized transgenic mice efficiently infected transgenic
mice expressing human PrP,
*** indicating that the species barrier from cervid to humans is prion
strain-dependent and humans can be vulnerable to novel cervid prion strains.
Preliminary results on CWD transmission in transgenic mice expressing human
PrP-129V will also be discussed.
Acknowledgement Supported by NINDS NS052319 and NIA AG14359.
PPo2-27:
Generation of a Novel form of Human PrPSc by Inter-species Transmission of
Cervid Prions
Marcelo A. Barria,1 Glenn C. Telling,2 Pierluigi Gambetti,3 James A.
Mastrianni4 and Claudio Soto1 1Mitchell Center for Alzheimer's disease and
related Brain disorders; Dept of Neurology; University of Texas Houston Medical
School; Houston, TX USA; 2Dept of Microbiology, Immunology & Molecular
Genetics and Neurology; Sanders Brown Center on Aging; University of Kentucky
Medical Center; Lexington, KY USA; 3Institute of Pathology; Case western Reserve
University; Cleveland, OH USA; 4Dept of Neurology; University of Chicago;
Chicago, IL USA
Prion diseases are infectious neurodegenerative disorders affecting humans
and animals that result from the conversion of normal prion protein (PrPC) into
the misfolded and infectious prion (PrPSc). Chronic wasting disease (CWD) of
cervids is a prion disorder of increasing prevalence within the United States
that affects a large population of wild and captive deer and elk. CWD is highly
contagious and its origin, mechanism of transmission and exact prevalence are
currently unclear. The risk of transmission of CWD to humans is unknown.
Defining that risk is of utmost importance, considering that people have been
infected by animal prions, resulting in new fatal diseases. To study the
possibility that human PrPC can be converted into the infectious form by CWD
PrPSc we performed experiments using the Protein Misfolding Cyclic Amplification
(PMCA) technique, which mimic in vitro the process of prion replication. Our
results show that cervid PrPSc can induce the pathological conversion of human
PrPC, but only after the CWD prion strain has been stabilized by successive
passages in vitro or in vivo. Interestingly, this newly generated human PrPSc
exhibits a distinct biochemical pattern that differs from any of the currently
known forms of human PrPSc, indicating that it corresponds to a novel human
prion strain.
*** Our findings suggest that CWD prions have the capability to infect
humans, and that this ability depends on CWD strain adaptation, implying that
the risk for human health progressively increases with the spread of CWD among
cervids.
PPo2-7:
Biochemical and Biophysical Characterization of Different CWD
Isolates
Martin L. Daus and Michael Beekes Robert Koch Institute; Berlin,
Germany
Key words: CWD, strains, FT-IR, AFM
Chronic wasting disease (CWD) is one of three naturally occurring forms of
prion disease. The other two are Creutzfeldt-Jakob disease in humans and scrapie
in sheep. CWD is contagious and affects captive as well as free ranging cervids.
As long as there is no definite answer of whether CWD can breach the species
barrier to humans precautionary measures especially for the protection of
consumers need to be considered.
*** In principle, different strains of CWD may be associated with different
risks of transmission to humans. Sophisticated strain differentiation as
accomplished for other prion diseases has not yet been established for CWD.
However, several different findings indicate that there exists more than one
strain of CWD agent in cervids. We have analysed a set of CWD isolates from
white-tailed deer and could detect at least two biochemically different forms of
disease-associated prion protein PrPTSE. Limited proteolysis with different
concentrations of proteinase K and/or after exposure of PrPTSE to different
pH-values or concentrations of Guanidinium hydrochloride resulted in distinct
isolate-specific digestion patterns. Our CWD isolates were also examined in
protein misfolding cyclic amplification studies. This showed different
conversion activities for those isolates that had displayed significantly
different sensitivities to limited proteolysis by PK in the biochemical
experiments described above. We further applied Fourier transform infrared
spectroscopy in combination with atomic force microscopy. This confirmed
structural differences in the PrPTSE of at least two disinct CWD isolates. The
data presented here substantiate and expand previous reports on the existence of
different CWD strains.
2012
Envt.06:
Zoonotic Potential of CWD: Experimental Transmissions to Non-Human Primates
Emmanuel Comoy,1,† Valérie Durand,1 Evelyne Correia,1 Aru Balachandran,2
Jürgen Richt,3 Vincent Beringue,4 Juan-Maria Torres,5 Paul Brown,1 Bob Hills6
and Jean-Philippe Deslys1
1Atomic Energy Commission; Fontenay-aux-Roses, France; 2Canadian Food
Inspection Agency; Ottawa, ON Canada; 3Kansas State University; Manhattan, KS
USA; 4INRA; Jouy-en-Josas, France; 5INIA; Madrid, Spain; 6Health Canada; Ottawa,
ON Canada
†Presenting author; Email: emmanuel.comoy@cea.fr
The constant increase of chronic wasting disease (CWD) incidence in North
America raises a question about their zoonotic potential. A recent publication
showed their transmissibility to new-world monkeys, but no transmission to
old-world monkeys, which are phylogenetically closer to humans, has so far been
reported. Moreover, several studies have failed to transmit CWD to transgenic
mice overexpressing human PrP. Bovine spongiform encephalopathy (BSE) is the
only animal prion disease for which a zoonotic potential has been proven. We
described the transmission of the atypical BSE-L strain of BSE to cynomolgus
monkeys, suggesting a weak cattle-to-primate species barrier. We observed the
same phenomenon with a cattleadapted strain of TME (Transmissible Mink
Encephalopathy). Since cattle experimentally exposed to CWD strains have also
developed spongiform encephalopathies, we inoculated brain tissue from
CWD-infected cattle to three cynomolgus macaques as well as to transgenic mice
overexpressing bovine or human PrP. Since CWD prion strains are highly
lymphotropic, suggesting an adaptation of these agents after peripheral
exposure, a parallel set of four monkeys was inoculated with CWD-infected cervid
brains using the oral route. Nearly four years post-exposure, monkeys exposed to
CWD-related prion strains remain asymptomatic.
*** In contrast, bovinized and humanized transgenic mice showed signs of
infection, suggesting that CWD-related prion strains may be capable of crossing
the cattle-to-primate species barrier. Comparisons with transmission results and
incubation periods obtained after exposure to other cattle prion strains (c-BSE,
BSE-L, BSE-H and cattle-adapted TME) will also be presented, in order to
evaluate the respective risks of each strain.
Envt.07:
Pathological Prion Protein (PrPTSE) in Skeletal Muscles of Farmed and Free
Ranging White-Tailed Deer Infected with Chronic Wasting Disease
Martin L. Daus,1,† Johanna Breyer,2 Katjs Wagenfuehr,1 Wiebke Wemheuer,2
Achim Thomzig,1 Walter Schulz-Schaeffer2 and Michael Beekes1 1Robert Koch
Institut; P24 TSE; Berlin, Germany; 2Department of Neuropathology, Prion and
Dementia Research Unit, University Medical Center Göttingen; Göttingen, Germany
†Presenting author; Email: dausm@rki.de
Chronic wasting disease (CWD) is a contagious, rapidly spreading
transmissible spongiform encephalopathy (TSE) occurring in cervids in North
America. Despite efficient horizontal transmission of CWD among cervids natural
transmission of the disease to other species has not yet been observed. Here, we
report a direct biochemical demonstration of pathological prion protein PrPTSE
and of PrPTSE-associated seeding activity in skeletal muscles of CWD-infected
cervids. The presence of PrPTSE was detected by Western- and postfixed frozen
tissue blotting, while the seeding activity of PrPTSE was revealed by protein
misfolding cyclic amplification (PMCA). The concentration of PrPTSE in skeletal
muscles of CWD-infected WTD was estimated to be approximately 2000- to
10000-fold lower than in brain tissue. Tissue-blot-analyses revealed that PrPTSE
was located in muscle- associated nerve fascicles but not, in detectable
amounts, in myocytes.
*** The presence and seeding activity of PrPTSE in skeletal muscle from
CWD-infected cervids suggests prevention of such tissue in the human diet as a
precautionary measure for food safety, pending on further clarification of
whether CWD may be transmissible to humans.
HD.13: CWD infection in the spleen of humanized transgenic mice
Liuting Qing and Qingzhong Kong
Case Western Reserve University; Cleveland, OH USA
Chronic wasting disease (CWD) is a widespread prion disease in free-ranging
and captive cervid species in North America, and there is evidence suggesting
the existence of multiple CWD strains. The susceptibility of human CNS and
peripheral organs to the various CWD prion strains remains largely unclear.
Current literature suggests that the classical CWD strain is unlikely to infect
human brain, but the potential for peripheral infection by CWD in humans is
unknown. We detected protease-resistant PrpSc in the spleens of a few humanized
transgenic mice that were intracerebrally inoculated with natural CWD isolates,
but PrpSc was not detected in the brains of any of the CWD-inoculated mice. Our
ongoing bioassays in humanized Tg mice indicate that intracerebral challenge
with such PrpSc-positive humanized mouse spleen already led to prion disease in
most animals.
*** These results indicate that the CWD prion may have the potential to
infect human peripheral lymphoid tissues.
=====
Oral.15: Molecular barriers to zoonotic prion transmission: Comparison of
the ability of sheep, cattle and deer prion disease isolates to convert normal
human prion protein to its pathological isoform in a cell-free system
Marcelo A.Barria,1 Aru Balachandran,2 Masanori Morita,3 Tetsuyuki
Kitamoto,4 Rona Barron,5 Jean Manson,5 Richard Kniqht,1 James W. lronside1 and
Mark W. Head1
1National CJD Research and Surveillance Unit; Centre for Clinical Brain
Sciences; School of Clinical Sciences; The University of Edinburgh; Edinburgh,
UK; 2National and OIE Reference Laboratory for Scrapie and CWD; Canadian Food
Inspection Agency; Ottawa Laboratory; Fallowfield. ON Canada; 3Infectious
Pathogen Research Section; Central Research Laboratory; Japan Blood Products
Organization; Kobe, Japan; 4Department of Neurological Science; Tohoku
University Graduate School of Medicine; Sendai. Japan; 5Neurobiology Division;
The Roslin Institute and R(D)SVS; University of Edinburgh; Easter Bush;
Midlothian; Edinburgh, UK
Background. Bovine spongiform encephalopathy (BSE) is a known zoonotic
prion disease, resulting in variant Creurzfeldt- Jakob disease (vCJD) in humans.
In contrast, classical scrapie in sheep is thought to offer little or no danger
to human health. However, a widening range of prion diseases have been
recognized in cattle, sheep and deer. The risks posed by individual animal prion
diseases to human health cannot be determined a priori and are difficult to
assess empirically. The fundamemal event in prion disease pathogenesis is
thought to be the seeded conversion of normal prion protein (PrPC) to its
pathological isoform (PrPSc). Here we report the use of a rapid molecular
conversion assay to test whether brain specimens from different animal prion
diseases are capable of seeding the conversion of human PrPC ro PrPSc.
Material and Methods. Classical BSE (C-type BSE), H-type BSE, L-type BSE,
classical scrapie, atypical scrapie, chronic wasting disease and vCJD brain
homogenates were tested for their ability to seed conversion of human PrPC to
PrPSc in protein misfolding cyclic amplification (PMCA) reactions. Newly formed
human PrPSc was detected by protease digestion and western blotting using the
antibody 3F4.
Results. C-type BSE and vCJD were found to efficiently convert PrPC to
PrPSc. Scrapie failed to convert human PrPC to PrPSc. Of the other animal prion
diseases tested only chronic wasting disease appeared to have the capability ro
convert human PrPC to PrPSc. The results were consistent whether the human PrPC
came from human brain, humanised transgenic mouse brain or from cultured human
cells and the effect was more pronounced for PrPC with methionine at codon 129
compared with that with valine.
Conclusion. Our results show that none of the tested animal prion disease
isolates are as efficient as C-type BSE and vCJD in converting human prion
protein in this in vitro assay.
*** However, they also show that there is no absolute barrier ro conversion
of human prion protein in the case of chronic wasting disease.
=====
AD.06: Detecting prions in the brain and blood of TSE-infected deer and
hamsters
Alan Elder,1 Davin Henderson,1 Anca Selariu,1 Amy Nalls,1 Byron Caughey,2
Richard Bessen,1 Jason Bartz3 and Candace Mathiason1
1Colorado State University; Fort Collins, CO USA; 2NIH Rocky Mountain
Laboratories; Hamilton, MT USA; 3Creighton University; Omaha, NE USA
While large quantities of protease resistant prion protein (PrPres) can be
demonstrated by western blot or IHC in lymphoid biopsies or post-mortem brain
tissues harvested from prion-infected animals, these conventional assays are
less reliable as means to detect the small quantities of prions thought to be
present in bodily fluids or associated with early and asymptomatic phases of TSE
disease. The Real Time-Quaking Induced Conversion (RT-QuIC) assay is capable of
detecting prions at concentrations below the level of sensitivity of
conventional assays and provides a real-time fluorescent readout negating the
use of proteases. We have made modifications to the RT-QuIC assay to utilize it
for the detection of PrPres in brain and blood harvested from various species
infected with prions. In this study, we analyzed CWD-infected deer and
CWD/TME-infected hamster whole blood to determine the effect of:
(1) various anticoagulants,
(2) freezing and
(3) NaPTA precipitation.
Brain tissue and blood collected from naive deer and hamsters served as
negative controls.
We were able to demonstrate amplifiable prions in
(1) brain and blood samples harvested from CWD/TME-infected animals,
(2) heparinized blood,
(3) frozen vs. fresh blood and
(4) NaPTA treated samples.
The RT-QuIC assay is able to detect PrPres in various species of animals
and shows promise as an antemortem diagnostic tool for blood-borne TSEs.
=====
PRION2013 CONGRESSIONAL ABSTRACTS CWD
Sunday, August 25, 2013
***Chronic Wasting Disease CWD risk factors, humans, domestic cats, blood,
and mother to offspring transmission
Sunday, July 21, 2013
*** As Chronic Wasting Disease CWD rises in deer herd, what about risk for
humans?
*** PRICE OF CWD TSE PRION POKER GOES UP 2014 ***
Transmissible Spongiform Encephalopathy TSE PRION update January 2, 2014
*** chronic wasting disease, there was no absolute barrier to conversion of
the human prion protein.
*** Furthermore, the form of human PrPres produced in this in vitro assay
when seeded with CWD, resembles that found in the most common human prion
disease, namely sCJD of the MM1 subtype.
Wednesday, January 01, 2014
Molecular Barriers to Zoonotic Transmission of Prions
*** chronic wasting disease, there was no absolute barrier to conversion of
the human prion protein.
*** Furthermore, the form of human PrPres produced in this in vitro assay
when seeded with CWD, resembles that found in the most common human prion
disease, namely sCJD of the MM1 subtype.
Friday, November 09, 2012
*** Chronic Wasting Disease CWD in cervidae and transmission to other
species
Sunday, November 11, 2012
*** Susceptibilities of Nonhuman Primates to Chronic Wasting Disease
November 2012
Friday, December 14, 2012
Susceptibility Chronic Wasting Disease (CWD) in wild cervids to Humans 2005
- December 14, 2012
Saturday, March 09, 2013
Chronic Wasting Disease in Bank Voles: Characterisation of the Shortest
Incubation Time Model for Prion Diseases
Thursday, January 2, 2014
*** CWD TSE Prion in cervids to hTGmice, Heidenhain Variant
Creutzfeldt-Jacob Disease MM1 genotype, and iatrogenic CJD ??? ***
http://download.thelancet.com/pdfs/journals/laninf/PIIS1473309903007151.pdf?id=baa1CkXPkhI3Ih_Vlh6ru
TSS
posted by Terry S. Singeltary Sr. at
10:53 AM
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