Caught up in the busy-ness of summer, Bluestem missed two contrasting news items about Chronic Wasting Disease (CWD) in cervids.
First, a press release from the University of Minnesota, Leading experts call for action to address Chronic Wasting Disease,
A team of national and state experts in public health, wildlife diseases, prion research and laboratory diagnosis is urgently calling for a comprehensive national strategy to reduce the risk for human exposure to Chronic Wasting Disease (CWD) and to limit the risk of transmission of CWD among wildlife, particularly cervids, and domestic animals.
CWD is a prion-related transmissible spongiform encephalopathy of cervids, including deer, elk, reindeer, sika deer and moose. CWD has been confirmed in at least 26 U.S. states, three Canadian provinces, South Korea, Finland, Norway and Sweden, with a notable increase in the past five years.
The continued geographic spread of this disease increases the frequency of exposure to CWD prions among cervids, humans and other animal species. Although CWD has not yet been found to cause infections in humans, numerous health agencies advise that people should not consume CWD-positive animals.
The team of experts from the Center for Infectious Disease Research and Policy (CIDRAP) at the University of Minnesota, as part of its Chronic Wasting Disease Response, Research and Policy Program; the Prion Research Center at Colorado State University; the National Prion Disease Pathology Surveillance Center at Case Western Reserve University; and the Minnesota Department of Health recommends several immediate steps that need to be taken to address this potential health crisis.
The steps were published today in the journal mBio by the American Society for Microbiology.
“We have learned a lot about CWD in deer and elk over the past several decades, but we now realize how much more we need to know to control its rapid spread and devastating impact in cervids,” said lead author Michael T. Osterholm, University of Minnesota Regents Professor, McKnight Presidential Endowed Chair in Public Health, and director of CIDRAP. “And we must understand the risk of transmission of CWD prions to humans with the ever increasing consumption of infected venison and how we reduce the possibility that one day we may have a tragic replay of a bovine spongiform encephalopathy or mad cow disease-like scenario in North America.”
The steps include:
Investing in CWD research. Adequate federal support allows state wildlife, animal health, and public health agencies to enhance hunter education and better develop and conduct comprehensive CWD management plans.
Enhancing mandatory CWD cervid testing. Mandatory testing of killed or dead cervids in all areas of endemicity and establishing associated monitoring systems that can be shared across states would provide more accurate data for wildlife managers and public policy makers. Improved surveillance would also foster more efficient responses and help prevent disease spread among cervids. Additionally, mandatory testing results in hunters knowing if consumption of their hunted cervid will expose them to CWD prions.
“Adoption of more sensitive, next generation diagnostic tests could identify early stage and nonclinical ‘carrier’ animals that likely contribute to direct and indirect transmission and environmental contamination that may be accelerating CWD spread,” said co-author Mark Zabel, professor in the College of Veterinary Medicine & Biomedical Sciences and associate director of the Prion Research Center at Colorado State University. “Identifying infected animals earlier could reduce environmental prion loads and save additional animals from this deadly disease.”
Improving cervid management. The Association of Fish and Wildlife Agencies has published best CWD management practices based on current science. These practices, including the movement of live cervids, carcass disposal and feeding/baiting, need to be implemented by states as soon as possible to improve the health of wild and farm-raised cervids and protect the nearly $40 billion annual contribution of wild cervid hunting in the United States.
Heightened surveillance of human prion diseases to determine if CWD is transmissible to humans. It is imperative that the U.S. Centers for Disease Control and Prevention continues its epidemiologic surveillance of human prion disease, especially in CWD endemic states. The only way to determine the etiology of prion disease in humans is via post-mortem analyses of brain tissue. Hence, it is crucial to continue neuropathological surveillance of patients with suspected prion disease to help determine whether or not CWD is transmissible to humans. . . .
Read the rest on the University of Minnesota's website. The release was picked up by the staff of the Brainerd Dispatch, which framed the news in light of the discovery of CWD in a wild northern Minnesota whitetail deer near Merrifield, adding this context:
On Jan. 23, a dead wild deer infected with CWD was located by Upper Mission Lake north of Merrifield, in close proximity to a game farm in which seven confirmed cases of CWD have been reported in captive deer as of 2018.
Following the Feb. 14 confirmation of CWD in the wild deer near Merrifield, landowners of 10 acres or more within a 2-mile radius of the game farm were permitted to kill deer to be tested for CWD. Federal wildlife specialists also killed deer to be tested in a 2-mile radius around where the infected deer was found. Those distances were selected as a deer's average home range is about 1 mile.
While no CWD was found in any of the deer taken by landowners, state or federal officials near Merrifield, the announcement of CWD in the one wild deer spurred efforts and proposals in the Minnesota Legislature for short-term and long-term solutions, including the creation of CWD task forces, buyout programs for game farms, funding for testing, moratoriums on possessing captive deer and creating a carcass disposal program. The Merrifield deer farm accepted a buyout and has closed.
Now there’s a national effort to combat CWD. . . .
Via Minnesota House Environment and Natural Resources chair Rick Hansen's legislative update, here's the Center for Infectious Disease Research and Policy (CIDRAP)'s version, Experts call for action on chronic wasting disease.
More recently, WCCO picked up an Associated Press report, ‘Unprecedented’ Midwest Chronic Wasting Disease Meeting Yields No New Approaches:
Midwestern wildlife officials wrapped up what was hailed as an unprecedented conference on chronic wasting disease Thursday without coming up with any new tactics for fighting the stubborn disease.
Experts from a host of states including North and South Dakota, Iowa, Kansas, Minnesota and Missouri attended the two-day meeting in Madison at the invitation of the Wisconsin Department of Natural Resources.
The meeting comes as Gov. Tony Evers, who controls the Wisconsin DNR, has offered no new plan for dealing with the disease. Wisconsin DNR Secretary Preston Cole, an Evers appointee, has said the governor wants to see if research comes up with anything new and he doesn’t want to duplicate research being done in other states. Cole began the conference Wednesday by urging the attendees to stop working in isolation. He told reporters that day that the conference was “unprecedented.”
But fresh ideas were few and far between. Retired Wisconsin DNR biologist Mike Foy, who has proposed offering bounties for every infected deer hunters shoot, watched the proceedings from the audience. He said the attendees looked beat.
“I was disappointed they didn’t talk about what they plan to do about growing prevalence (of the disease),” he said after the conference ended. “To me that’s the huge issue. We’ll live or die on how we control prevalence.”
Wisconsin DNR Wildlife Health Section Chief Tami Ryan said after the meeting ended that the conference wasn’t designed to produce any new strategies.
“We didn’t come out of here with a silver bullet but that wasn’t the expectation,” she said. . . .
Read the rest at WCCO.
Photo: A whitetail deer suffering from the advanced stages of CWD. Via University of Minnesota, Leading experts call for action to address Chronic Wasting Disease.
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