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Monday, November 17, 2014

Deer baiting a double-edged sword for Michigan farmers

Deer baiting a double-edged sword for Michigan farmers
 
Whether you are for or against regulation, deer baiting has consequences for Michigan agriculture. Posted on November 12, 2014 by James DeDecker, Michigan State University Extension

 

Culled apples for sale as deer feed. Photo credit: James DeDecker, Michigan State University Extension Culled apples for sale as deer feed. Photo credit: James DeDecker, Michigan State University Extension

 

The practice of baiting white-tailed deer with apples, corn, sugarbeets or carrots continues to raise controversy in the Midwest. In 2014, the state of Wisconsin has banned deer baiting in 35 counties impacted by Chronic Wasting Disease (CWD). Minnesotans continue to debate current penalties for violation of their statewide baiting ban, including revocation of deer hunting licenses for one year and the seizing of firearms and bows used to hunt over bait. In April, the Michigan Natural Resources Commission reaffirmed its policy allowing deer baiting in all but four northeastern counties (Alcona, Alpena, Montmorency and Oscoda), but continues to restrict bait to 2 gallons spread across a minimum 10-x-10-foot area. Michigan’s current policy represents a compromise not only between those for and against deer baiting, but between differing agriculture interests as well.

 

The central argument against deer baiting is its potential to congregate animals in ways that increase the potential for disease transmission through food, feces and urine. There is significant evidence that feeding deer can perpetuate diseases like Bovine Tuberculosis (TB) and CWD. This lead Michigan Farm Bureau to publically oppose the lifting of Michigan’s baiting ban in 2011. Michigan livestock farmers have invested in herd testing and wildlife mitigation measures, such as fencing woodlots and protecting feed, to control TB. This September, the U.S. Department of Agriculture upgraded the status of seven counties in northern Michigan to TB-free. Deer baiting works against these investments and hard-won progress.

 

However, the foods used as bait are agricultural products, and the baiting market offers advantages for some Michigan producers. Each season a significant portion of fruit and vegetable crops are rendered unsuitable for their primary markets by insect, disease or physiological issues. The deer bait market provides an outlet for this lower quality produce. In the 1990s, prior to restriction of deer baiting in Michigan, the farm gate value of cull carrots for bait was estimated to total $2.2 million statewide.

 

In some cases, the deer bait market also offers price advantages over traditional markets. For example, deer corn is currently selling at $5-$8 per 50-pound bag. This translates into $6-$9.60 per bushel, a range significantly exceeding the current market price. Some of this price increase is associated with bagging and marketing costs. Still, the bait market has the potential to put more money into the farmer’s pocket per bushel sold, especially in the case of direct on-farm sales.

 

This season, in the majority of Michigan counties, the decision to bait deer or not will be left to hunters. Michigan State University Extension recommends hunters review baiting regulations by watching the MDNR YouTube video titled Michigan Baiting and Feeding Rules. As the public conversation on this difficult issue continues, it is imperative that Michigan’s farming community remains engaged to protect the diverse interests of all its members.

 

References

 

Baiting Ban Repealed: What Difference Will it Make?, Michigan Farm Bureau Baiting and Feeding: The problem that Will Not Go Away, University of Wisconsin Extension Deer Baiting Issues in Michigan, Michigan DNR Wildlife Division Minnesota Bill Would Lessen Deer-baiting Penalties, TwinCities.com Regulating Hunter Baiting for White-Tailed Deer in Michigan: Biological and Social Considerations, Wildlife Society Bulletin Lifting of Michigan deer-baiting ban reopens market for growers, Vegetable Growers News Deer hunters likely to see bait prices rise, Michigan Outdoor News This article was published by Michigan State University Extension. For more information, visit http://www.msue.msu.edu. To have a digest of information delivered straight to your email inbox, visit http://bit.ly/MSUENews. To contact an expert in your area, visit http://expert.msue.msu.edu, or call 888-MSUE4MI (888-678-3464).

 


 

 Chronic Wasting Disease and the Science in support of the Ban on Baiting and Feeding Deer.

 

Timothy R. Van Deelen Ph.D. Wisconsin DNR Research

 

Summary

 

Reliable science provides support for a ban of baiting and feeding of white-tailed deer to reduce disease risks for Chronic Wasting Disease (CWD). Peer-reviewed research papers published in reputable scientific journals indicate the following:

 

Deer can get CWD by ingesting something contaminated with the disease prion CWD prions may be shed in feces and saliva

 

Disease course and symptoms indicate high potential for transmission where deer are concentrated

 

Evidence from captive situations indicates that deer can get CWD from highly contaminated environments.

 

Baiting and Feeding causes unnatural concentration of deer

 

Reduction of contact through a ban on baiting and feeding is likely very important to eradicating or containing a CWD outbreak.

 

Baiting and feeding continues to put Wisconsin's deer herd at risk to other serious diseases

 

In addition, experts in CWD, wildlife disease and deer nutrition support bans on baiting and feeding as part of a comprehensive strategy to prevent and/or manage CWD.

 

Under a baiting and feeding ban, disease outbreaks are more likely to be smaller in scale and more apt to be contained or eliminated. With the long CWD incubation period and other factors that make discovery of a new outbreak difficult, an outbreak that is already widespread when detected because of baiting and feeding may not be able to be contained or eliminated.

 

SNIP...SEE FULL TEXT ;

 


 

Review in Advance first posted online on October 2, 2014. (Changes may still occur before final publication online and in print.)

 

Chronic Wasting Disease of Cervids: Current Knowledge and Future Perspectives

 

Nicholas J. Haley1 and Edward A. Hoover2

 

1Department of Diagnostic Medicine/Pathobiology, Kansas State University College of Veterinary Medicine, Manhattan, Kansas 66506; email: nhaley@vet.k-state.edu 2Prion Research Center, Department of Microbiology, Immunology, and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado 80523; email: edward.hoover@colostate.edu

 

SNIP...

 

The aggregation of wildlife via feeding and baiting practices is sure to increase animal-animal contact and in many areas has been prohibited to lessen the opportunity for CWD spread (137). Control

 

SNIP...

 

ABSTRACT

 

Chronic Wasting Disease of Cervids: Current Knowledge and Future Perspectives

 

Annual Review of Animal Biosciences Review in Advance first posted online on October 2, 2014. (Changes may still occur before final publication print.) DOI: 10.1146/annurev-animal-022114-111001 Nicholas J. Haley Department of Diagnostic Medicine/Pathobiology, Kansas State University College of Veterinary Medicine, Manhattan, KS 66506; email: nhaley@vet.k-state.edu Edward A. Hoover Prion Research Center, Department of Microbiology, Immunology, and Pathology, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523; email: edward.hoover@colostate.edu FULL-TEXT| PDFPDF (1503 KB)| Permissions | Reprints Citation: PubMed| Download| Email notification| ABSTRACT A naturally occurring transmissible spongiform encephalopathy (TSE) of mule deer was first reported in Colorado and Wyoming in 1967 and has since spread to other members of the cervid family in 22 states, 2 Canadian provinces, and the Republic of Korea. Chronic wasting disease (CWD), caused by exposure to an abnormally folded isoform of the cellular prion protein, is characterized by progressive neurological disease in susceptible natural and experimental hosts and is ultimately fatal.CWDis thought to be transmitted horizontally in excreta and through contaminated environments, features common to scrapie of sheep, though rare among TSEs. Evolving detection methods have revealed multiple strains of CWD and with continued development may lead to an effective antemortem test. Managing the spread of CWD, through the development of a vaccine or environmental cleanup strategies, is an active area of interest. As such, CWD represents a unique challenge in the study of prion diseases.

 

Expected final online publication date for the Annual Review of Animal Biosciences Volume 3 is February 15, 2015. Please see http://www.annualreviews.org/catalog/pubdates.aspx for revised estimates.

 


 

Paper

 

Persistence of ovine scrapie infectivity in a farm environment following cleaning and decontamination

 

Steve A. C. Hawkins, MIBiol, Pathology Department1, Hugh A. Simmons, BVSc MRCVS, MBA, MA Animal Services Unit1, Kevin C. Gough, BSc, PhD2 and Ben C. Maddison, BSc, PhD3 + Author Affiliations

 

1Animal and Plant Health Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, UK 2School of Veterinary Medicine and Science, The University of Nottingham, Sutton Bonington, Loughborough, Leicestershire LE12 5RD, UK 3ADAS UK, School of Veterinary Medicine and Science, The University of Nottingham, Sutton Bonington, Loughborough, Leicestershire LE12 5RD, UK E-mail for correspondence: ben.maddison@adas.co.uk Abstract Scrapie of sheep/goats and chronic wasting disease of deer/elk are contagious prion diseases where environmental reservoirs are directly implicated in the transmission of disease. In this study, the effectiveness of recommended scrapie farm decontamination regimens was evaluated by a sheep bioassay using buildings naturally contaminated with scrapie. Pens within a farm building were treated with either 20,000 parts per million free chorine solution for one hour or were treated with the same but were followed by painting and full re-galvanisation or replacement of metalwork within the pen. Scrapie susceptible lambs of the PRNP genotype VRQ/VRQ were reared within these pens and their scrapie status was monitored by recto-anal mucosa-associated lymphoid tissue. All animals became infected over an 18-month period, even in the pen that had been subject to the most stringent decontamination process. These data suggest that recommended current guidelines for the decontamination of farm buildings following outbreaks of scrapie do little to reduce the titre of infectious scrapie material and that environmental recontamination could also be an issue associated with these premises.

 

SNIP...

 

Discussion

 

Thorough pressure washing of a pen had no effect on the amount of bioavailable scrapie infectivity (pen B). The routine removal of prions from surfaces within a laboratory setting is treatment for a minimum of one hour with 20,000 ppm free chlorine, a method originally based on the use of brain macerates from infected rodents to evaluate the effectiveness of decontamination (Kimberlin and others 1983). Further studies have also investigated the effectiveness of hypochlorite disinfection of metal surfaces to simulate the decontamination of surgical devices within a hospital setting. Such treatments with hypochlorite solution were able to reduce infectivity by 5.5 logs to lower than the sensitivity of the bioassay used (Lemmer and others 2004). Analogous treatment of the pen surfaces did not effectively remove the levels of scrapie infectivity over that of the control pens, indicating that this method of decontamination is not effective within a farm setting. This may be due to the high level of biological matrix that is present upon surfaces within the farm environment, which may reduce the amount of free chlorine available to inactivate any infectious prion. Remarkably 1/5 sheep introduced into pen D had also became scrapie positive within nine months, with all animals in this pen being RAMALT positive by 18 months of age. Pen D was no further away from the control pen (pen A) than any of the other pens within this barn. Localised hot spots of infectivity may be present within scrapie-contaminated environments, but it is unlikely that pen D area had an amount of scrapie contamination that was significantly different than the other areas within this building. Similarly, there were no differences in how the biosecurity of pen D was maintained, or how this pen was ventilated compared with the other pens. This observation, perhaps, indicates the slower kinetics of disease uptake within this pen and is consistent with a more thorough prion removal and recontamination. These observations may also account for the presence of inadvertent scrapie cases within other studies, where despite stringent biosecurity, control animals have become scrapie positive during challenge studies using barns that also housed scrapie-affected animals (Ryder and others 2009). The bioassay data indicate that the exposure of the sheep to a farm environment after decontamination efforts thought to be effective in removing scrapie is sufficient for the animals to become infected with scrapie. The main exposure routes within this scenario are likely to be via the oral route, during feeding and drinking, and respiratory and conjunctival routes. It has been demonstrated that scrapie infectivity can be efficiently transmitted via the nasal route in sheep (Hamir and others 2008), as is the case for CWD in both murine models and in white-tailed deer (Denkers and others 2010, 2013). Recently, it has also been demonstrated that CWD prions presented as dust when bound to the soil mineral montmorillonite can be infectious via the nasal route (Nichols and others 2013). When considering pens C and D, the actual source of the infectious agent in the pens is not known, it is possible that biologically relevant levels of prion survive on surfaces during the decontamination regimen (pen C). With the use of galvanising and painting (pen D) covering and sealing the surface of the pen, it is possible that scrapie material recontaminated the pens by the movement of infectious prions contained within dusts originating from other parts of the barn that were not decontaminated or from other areas of the farm.

 

Given that scrapie prions are widespread on the surfaces of affected farms (Maddison and others 2010a), irrespective of the source of the infectious prions in the pens, this study clearly highlights the difficulties that are faced with the effective removal of environmentally associated scrapie infectivity. This is likely to be paralleled in CWD which shows strong similarities to scrapie in terms of both the dissemination of prions into the environment and the facile mode of disease transmission. These data further contribute to the understanding that prion diseases can be highly transmissible between susceptible individuals not just by direct contact but through highly stable environmental reservoirs that are refractory to decontamination.

 

The presence of these environmentally associated prions in farm buildings make the control of these diseases a considerable challenge, especially in animal species such as goats where there is lack of genetic resistance to scrapie and, therefore, no scope to re-stock farms with animals that are resistant to scrapie.

 

Scrapie Sheep Goats Transmissible spongiform encephalopathies (TSE) Accepted October 12, 2014. Published Online First 31 October 2014

 


 

2012

 

PO-039: A comparison of scrapie and chronic wasting disease in white-tailed deer

 

Justin Greenlee, Jodi Smith, Eric Nicholson US Dept. Agriculture; Agricultural Research Service, National Animal Disease Center; Ames, IA USA

 

snip...

 

The results of this study suggest that there are many similarities in the manifestation of CWD and scrapie in WTD after IC inoculation including early and widespread presence of PrPSc in lymphoid tissues, clinical signs of depression and weight loss progressing to wasting, and an incubation time of 21-23 months. Moreover, western blots (WB) done on brain material from the obex region have a molecular profile similar to CWD and distinct from tissues of the cerebrum or the scrapie inoculum. However, results of microscopic and IHC examination indicate that there are differences between the lesions expected in CWD and those that occur in deer with scrapie: amyloid plaques were not noted in any sections of brain examined from these deer and the pattern of immunoreactivity by IHC was diffuse rather than plaque-like.

 

*** After a natural route of exposure, 100% of WTD were susceptible to scrapie.

 

Deer developed clinical signs of wasting and mental depression and were necropsied from 28 to 33 months PI. Tissues from these deer were positive for PrPSc by IHC and WB. Similar to IC inoculated deer, samples from these deer exhibited two different molecular profiles: samples from obex resembled CWD whereas those from cerebrum were similar to the original scrapie inoculum. On further examination by WB using a panel of antibodies, the tissues from deer with scrapie exhibit properties differing from tissues either from sheep with scrapie or WTD with CWD. Samples from WTD with CWD or sheep with scrapie are strongly immunoreactive when probed with mAb P4, however, samples from WTD with scrapie are only weakly immunoreactive. In contrast, when probed with mAb’s 6H4 or SAF 84, samples from sheep with scrapie and WTD with CWD are weakly immunoreactive and samples from WTD with scrapie are strongly positive. 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.

 


 

Scrapie in Deer: Comparisons and Contrasts to Chronic Wasting Disease (CWD)

 

Justin J. Greenlee of the Virus and Prion Diseases Research Unit, National Animal Disease Center, ARS, USDA, Ames, IA

 

snip...

 

This highlights the facts that

 

1) prior to the onset of clinical signs PrPSc is widely distributed in the CNS and lymphoid tissues and

 

2) currently used diagnostic methods are sufficient to detect PrPSc prior to the onset of clinical signs.

 

The results of this study suggest that there are many similarities in the manifestation of CWD and scrapie in white-tailed deer after IC inoculation including early and widespread presence of PrPSc in lymphoid tissues, clinical signs of depression and weight loss progressing to wasting, and an incubation time of 21-23 months. Moreover, western blots (WB) done on brain material from the obex region have a molecular profile consistent with CWD and distinct from tissues of the cerebrum or the scrapie inoculum. However, results of microscopic and IHC examination indicate that there are differences between the lesions expected in CWD and those that occur in deer with scrapie: amyloid plaques were not noted in any sections of brain examined from these deer and the pattern of immunoreactivity by IHC was diffuse rather than plaque-like. After a natural route of exposure, 100% of white-tailed deer were susceptible to scrapie. Deer developed clinical signs of wasting and mental depression and were necropsied from 28 to 33 months PI. Tissues from these deer were positive for scrapie by IHC and WB. Tissues with PrPSc immunoreactivity included brain, tonsil, retropharyngeal and mesenteric lymph nodes, hemal node, Peyer’s patches, and spleen. While two WB patterns have been detected in brain regions of deer inoculated by the natural route, unlike the IC inoculated deer, the pattern similar to the scrapie inoculum predominates.

 


 

2011 Annual Report

 

Research Project: TRANSMISSION, DIFFERENTIATION, AND PATHOBIOLOGY OF TRANSMISSIBLE SPONGIFORM ENCEPHALOPATHIES Location: 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.

 

snip...

 

4. Accomplishments

 

1. Deer inoculated with domestic isolates of sheep scrapie. Scrapie-affected deer exhibit 2 different patterns of disease associated prion protein. In some regions of the brain the pattern is much like that observed for scrapie, while in others it is more like chronic wasting disease (CWD), the transmissible spongiform encephalopathy typically associated with deer.

 

his 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

 

Jodi D. Smith, Justin J. Greenlee, and Robert A. Kunkle; Virus and Prion Research Unit, National Animal Disease Center, USDA-ARS

 

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 ;

 


 

SEE MORE USAHA REPORTS HERE, 2012 NOT PUBLISHED YET...TSS

 


 


 


 

*** 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.

 


 

*** Conclusion. CWD prions (as inferred by prion seeding activity by RT-QuIC) are shed in urine of infected deer as early as 6 months post inoculation and throughout the subsequent disease course. Further studies are in progress refining the real-time urinary prion assay sensitivity and we are examining more closely the excretion time frame, magnitude, and sample variables in relationship to inoculation route and prionemia in naturally and experimentally CWD-infected cervids.

 

*** Conclusions. During the pre-symptomatic stage of CWD infection and throughout the course of disease deer may be shedding multiple LD50 doses per day in their saliva. CWD prion shedding through saliva and excreta may account for the unprecedented spread of this prion disease in nature. Acknowledgments. Supported by NIH grant RO1-NS-061902 and grant D12ZO-045 from the Morris Animal Foundation.

 


 

*** We conclude that TSE infectivity is likely to survive burial for long time periods with minimal loss of infectivity and limited movement from the original burial site. However PMCA results have shown that there is the potential for rainwater to elute TSE related material from soil which could lead to the contamination of a wider area. These experiments reinforce the importance of risk assessment when disposing of TSE risk materials.

 

*** The results show that even highly diluted PrPSc can bind efficiently to polypropylene, stainless steel, glass, wood and stone and propagate the conversion of normal prion protein. For in vivo experiments, hamsters were ic injected with implants incubated in 1% 263K-infected brain homogenate. Hamsters, inoculated with 263K-contaminated implants of all groups, developed typical signs of prion disease, whereas control animals inoculated with non-contaminated materials did not.

 

PRION 2014 CONFERENCE

 

CHRONIC WASTING DISEASE CWD

 

A FEW FINDINGS ;

 

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.

 

We conclude that TSE infectivity is likely to survive burial for long time periods with minimal loss of infectivity and limited movement from the original burial site. However PMCA results have shown that there is the potential for rainwater to elute TSE related material from soil which could lead to the contamination of a wider area. These experiments reinforce the importance of risk assessment when disposing of TSE risk materials.

 

The results show that even highly diluted PrPSc can bind efficiently to polypropylene, stainless steel, glass, wood and stone and propagate the conversion of normal prion protein. For in vivo experiments, hamsters were ic injected with implants incubated in 1% 263K-infected brain homogenate. Hamsters, inoculated with 263K-contaminated implants of all groups, developed typical signs of prion disease, whereas control animals inoculated with non-contaminated materials did not.

 

Our data establish that meadow voles are permissive to CWD via peripheral exposure route, suggesting they could serve as an environmental reservoir for CWD. Additionally, our data are consistent with the hypothesis that at least two strains of CWD circulate in naturally-infected cervid populations and provide evidence that meadow voles are a useful tool for CWD strain typing.

 

Conclusion. CWD prions are shed in saliva and urine of infected deer as early as 3 months post infection and throughout the subsequent >1.5 year course of infection. In current work we are examining the relationship of prionemia to excretion and the impact of excreted prion binding to surfaces and particulates in the environment.

 

*** Conclusion. CWD prions (as inferred by prion seeding activity by RT-QuIC) are shed in urine of infected deer as early as 6 months post inoculation and throughout the subsequent disease course. Further studies are in progress refining the real-time urinary prion assay sensitivity and we are examining more closely the excretion time frame, magnitude, and sample variables in relationship to inoculation route and prionemia in naturally and experimentally CWD-infected cervids.

 

Conclusions. Our results suggested that the odds of infection for CWD is likely controlled by areas that congregate deer thus increasing direct transmission (deer-to-deer interactions) or indirect transmission (deer-to-environment) by sharing or depositing infectious prion proteins in these preferred habitats. Epidemiology of CWD in the eastern U.S. is likely controlled by separate factors than found in the Midwestern and endemic areas for CWD and can assist in performing more efficient surveillance efforts for the region.

 

Conclusions. During the pre-symptomatic stage of CWD infection and throughout the course of disease deer may be shedding multiple LD50 doses per day in their saliva. CWD prion shedding through saliva and excreta may account for the unprecedented spread of this prion disease in nature.

 

see full text and more ;

 

Monday, June 23, 2014

 

*** PRION 2014 CONFERENCE CHRONIC WASTING DISEASE CWD

 


 


 

*** Infectious agent of sheep scrapie may persist in the environment for at least 16 years***

 

Gudmundur Georgsson1, Sigurdur Sigurdarson2 and Paul Brown3

 


 

New studies on the heat resistance of hamster-adapted scrapie agent: Threshold survival after ashing at 600°C suggests an inorganic template of replication

 


 

Prion Infected Meat-and-Bone Meal Is Still Infectious after Biodiesel Production

 


 

Detection of protease-resistant cervid prion protein in water from a CWD-endemic area

 


 

A Quantitative Assessment of the Amount of Prion Diverted to Category 1 Materials and Wastewater During Processing

 


 

Rapid assessment of bovine spongiform encephalopathy prion inactivation by heat treatment in yellow grease produced in the industrial manufacturing process of meat and bone meals

 


 

Friday, December 14, 2012

 

DEFRA U.K. What is the risk of Chronic Wasting Disease CWD being introduced into Great Britain? A Qualitative Risk Assessment October 2012

 


 


 

*** We conclude that TSE infectivity is likely to survive burial for long time periods with minimal loss of infectivity and limited movement from the original burial site. However PMCA results have shown that there is the potential for rainwater to elute TSE related material from soil which could lead to the contamination of a wider area. These experiments reinforce the importance of risk assessment when disposing of TSE risk materials.

 

*** The results show that even highly diluted PrPSc can bind efficiently to polypropylene, stainless steel, glass, wood and stone and propagate the conversion of normal prion protein. For in vivo experiments, hamsters were ic injected with implants incubated in 1% 263K-infected brain homogenate. Hamsters, inoculated with 263K-contaminated implants of all groups, developed typical signs of prion disease, whereas control animals inoculated with non-contaminated materials did not.

 

 

Friday, December 14, 2012

 

DEFRA U.K. What is the risk of Chronic Wasting Disease CWD being introduced into Great Britain? A Qualitative Risk Assessment October 2012

 

snip...

 

In the USA, under the Food and Drug Administration’s BSE Feed Regulation (21 CFR 589.2000) most material (exceptions include milk, tallow, and gelatin) from deer and elk is prohibited for use in feed for ruminant animals. With regards to feed for non-ruminant animals, under FDA law, CWD positive deer may not be used for any animal feed or feed ingredients.

 

***For elk and deer considered at high risk for CWD, the FDA recommends that these animals do not enter the animal feed system.

 

***However, this recommendation is guidance and not a requirement by law. ***

 

Animals considered at high risk for CWD include:

 

1) animals from areas declared to be endemic for CWD and/or to be CWD eradication zones and

 

2) deer and elk that at some time during the 60-month period prior to slaughter were in a captive herd that contained a CWD-positive animal.

 

***Therefore, in the USA, materials from cervids other than CWD positive animals may be used in animal feed and feed ingredients for non-ruminants.

 

The amount of animal PAP that is of deer and/or elk origin imported from the USA to GB can not be determined, however, as it is not specified in TRACES. It may constitute a small percentage of the 8412 kilos of non-fish origin processed animal proteins that were imported from US into GB in 2011.

 

Overall, therefore, it is considered there is a __greater than negligible risk___ that (nonruminant) animal feed and pet food containing deer and/or elk protein is imported into GB.

 

There is uncertainty associated with this estimate given the lack of data on the amount of deer and/or elk protein possibly being imported in these products.

 

snip...

 

36% in 2007 (Almberg et al., 2011). In such areas, population declines of deer of up to 30 to 50% have been observed (Almberg et al., 2011). In areas of Colorado, the prevalence can be as high as 30% (EFSA, 2011). The clinical signs of CWD in affected adults are weight loss and behavioural changes that can span weeks or months (Williams, 2005). In addition, signs might include excessive salivation, behavioural alterations including a fixed stare and changes in interaction with other animals in the herd, and an altered stance (Williams, 2005). These signs are indistinguishable from cervids experimentally infected with bovine spongiform encephalopathy (BSE). Given this, if CWD was to be introduced into countries with BSE such as GB, for example, infected deer populations would need to be tested to differentiate if they were infected with CWD or BSE to minimise the risk of BSE entering the human food-chain via affected venison.

 

snip...

 

The rate of transmission of CWD has been reported to be as high as 30% and can approach 100% among captive animals in endemic areas (Safar et al., 2008).

 

snip...

 

In summary, in endemic areas, there is a medium probability that the soil and surrounding environment is contaminated with CWD prions and in a bioavailable form. In rural areas where CWD has not been reported and deer are present, there is a greater than negligible risk the soil is contaminated with CWD prion.

 

snip...

 

In summary, given the volume of tourists, hunters and servicemen moving between GB and North America, the probability of at least one person travelling to/from a CWD affected area and, in doing so, contaminating their clothing, footwear and/or equipment prior to arriving in GB is greater than negligible. For deer hunters, specifically, the risk is likely to be greater given the increased contact with deer and their environment. However, there is significant uncertainty associated with these estimates.

 

snip...

 

Therefore, it is considered that farmed and park deer may have a higher probability of exposure to CWD transferred to the environment than wild deer given the restricted habitat range and higher frequency of contact with tourists and returning GB residents.

 

snip...

 


 

SNIP...SEE ;

 

Friday, December 14, 2012

 

DEFRA U.K. What is the risk of Chronic Wasting Disease CWD being introduced into Great Britain? A Qualitative Risk Assessment October 2012

 


 

Friday, December 14, 2012

 

DEFRA U.K. What is the risk of Chronic Wasting Disease CWD being introduced into Great Britain? A Qualitative Risk Assessment October 2012

 


 


 

Sunday, November 3, 2013

 

Environmental Impact Statements; Availability, etc.: Animal Carcass Management [Docket No. APHIS-2013-0044]

 


 

Friday, October 17, 2014

 

Missouri Final action on Orders of Rule making Breeders and Big Game Hunting Preserves

 


 

Saturday, October 18, 2014

 

Chronic wasting disease threatens Canadian agriculture, Alberta MLA says

 


 

Thursday, October 23, 2014

 

FIRST CASE OF CHRONIC WASTING DISEASE CONFIRMED IN OHIO ON PRIVATE PRESERVE

 


 

Tuesday, October 21, 2014

 

Pennsylvania Department of Agriculture Tenth Pennsylvania Captive Deer Tests Positive for Chronic Wasting Disease CWD TSE PRION DISEASE

 


 

Tuesday, October 07, 2014

 

Wisconsin white-tailed deer tested positive for CWD on a Richland County breeding farm, and a case of CWD has been discovered on a Marathon County hunting preserve

 


 

Thursday, October 02, 2014

 

IOWA TEST RESULTS FROM CAPTIVE DEER HERD WITH CHRONIC WASTING DISEASE RELEASED 79.8 percent of the deer tested positive for the disease

 


 

Thursday, July 03, 2014

 

*** How Chronic Wasting Disease is affecting deer population and what’s the risk to humans and pets?

 


 

Tuesday, July 01, 2014

 

*** CHRONIC WASTING DISEASE CWD TSE PRION DISEASE, GAME FARMS, AND POTENTIAL RISK FACTORS THERE FROM

 


 

Saturday, October 25, 2014

 

118th USAHA Annual Meeting CWD and Captive Cerivds

 


 

PA House Receives Update on CWD in PA

 

Deputy Mathew Meals and Dr. Craig Shultz and officials from the PA Game Commission presented the latest information on Chronic Wasting Disease in PA to the House Game & Fisheries Committee yesterday. PDA discussed its efforts to manage CWD in the 1,100 captive deer herds. 32 deer herds are currently quarantined to thwart the spread of the disease.

 

snip...see full text ;

 


 

Tuesday, November 04, 2014

 

Six-year follow-up of a point-source exposure to CWD contaminated venison in an Upstate New York community: risk behaviours and health outcomes 2005–2011

 

UPDATED SCIENCE ON CWD TO HUMAN RISK FACTORS

 


 

Sunday, December 29, 2013

 

Impacts of wildlife baiting and supplemental feeding on infectious disease transmission risk: A synthesis of knowledge

 


 

Sunday, September 01, 2013

 

hunting over gut piles and CWD TSE prion disease

 


 

Friday, October 26, 2012

 

CHRONIC WASTING DISEASE CWD PENNSYLVANIA GAME FARMS, URINE ATTRACTANT PRODUCTS, BAITING, AND MINERAL LICKS

 


 

Monday, January 05, 2009

 

CWD, GAME FARMS, BAITING, AND POLITICS

 


 

Thursday, August 28, 2008

 

cwd, feeding, and baiting piles

 


 

CWD MICHIGAN UPDATE

 

September 5, 2008

 


 

 

-------- Original Message --------

 

Subject: Experts warn against feeding deer !!!

 

Date: Wed, 23 Apr 2003 09:27:42 –0500

 

From: "Terry S. Singeltary Sr."

 

To: Bovine Spongiform Encephalopathy

 

CC: CJDvoice , bloodcjd

 

Experts warn against feeding deer 11:48 PM 4/22/03 Ron Seely Environment reporter

 

Feeding and baiting deer, even with small amounts of feed, could hasten the spread of chronic wasting disease through the state's deer herd, according to a panel of national wildlife experts.

 

The six-member panel wrapped up a two-day evaluation of Wisconsin's fight against CWD Tuesday by answering questions from members of the Natural Resources Board, which will vote today on a package of rules designed to help control the fatal deer disease.

 

The panel had high praise for the DNR's efforts to fight CWD.

 

"I think the DNR is doing a commendable job," said R. Larry Marchinton, a professor emeritus of wildlife biology from the University of Georgia. "The rest of the country is grateful."

 

Most of Tuesday's discussion dealt with baiting and feeding wild deer and whether a controversial statewide ban should be partially lifted. Baiting involves putting out grain to attract deer so they can be shot during hunting season. Feeding is the popular practice, especially in northern Wisconsin, of putting out grain to attract deer for viewing.

 

The state Legislature's Joint Committee on the Review of Administrative Rules has threatened to let the feeding and baiting ban die when the rules expire Friday if the board does not agree today to partially lift the ban.

 

That difficult decision was made even harder by Tuesday's discussion between the board and the members of the CWD program review panel. Board member Stephen Willett, who is from Phillips in northern Wisconsin, asked members about the risk of allowing feeding and baiting, both of which have deep cultural roots in the state.

 

Stephen Schmitt, a wildlife veterinarian who heads the Michigan Department of Natural Resources' Wildlife Disease Laboratory, left little doubt about the scientific view.

 

"I think scientifically there is little doubt that feeding and baiting increase the risk of transmission of any communicable disease," Schmitt said. "That's where the science is."

 

Schmitt said his recommendation would be a complete ban on baiting and feeding wild deer. Other members of the panel agreed with him.

 

Beth Williams, a specialist on chronic wasting disease from the University of Wyoming, said she is convinced that the disease is transmitted animal-to-animal. She said tests are not sensitive enough to detect the CWD-causing proteins, called prions, in urine, feces or saliva. But healthy animals have contracted the disease in many instances when placed with infected deer, Williams said.

 

"The disease is clearly transmissible," Williams said.

 

Also, Williams added, healthy deer who are orally inoculated with CWD prions always get the disease.

 

"It's essentially very easy to infect an animals with CWD," Williams said.

 

Members of the panel also said limiting the amount of feed does little to reduce the dangers of feeding or baiting and can actually cause animals to come in closer contact.

 


 

 

TSS

 

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