Could Humans Get Chronic Wasting Disease?

  • A deer wasting away from Chronic Wasting Disease. (Photo courtesy of Michigan's Department of Natural Resources.)

A disease that infects deer and elk has been alarming wildlife officials and hunters for years. But now it seems the disease could be more dangerous than previously thought. The Great Lakes Radio Consortium’s Christina Shockley reports:

Transcript

A disease that infects deer and elk has been alarming wildlife officials
and hunters for years, but now it seems the disease could be more
dangerous than previously thought. The Great Lakes Radio Consortium’s
Christina Shockley reports:


Chronic Wasting Disease, or CWD, affects the brain tissue of deer and
elk. Sponge-like holes form in the brains of sick animals. The deer
begin to waste away, become weak, and then die.


Since CWD was discovered in Colorado nearly forty years ago, wild deer
in nine other states have tested positive for the disease. Little is known
about CWD – including how to stop it.


What scientists do know is that the infectious proteins-called prions –
thought to cause CWD are found in the brain and spinal cord areas of
infected animals, but officials still don’t have the answer to the big
question.


Judd Aiken is a professor of Animal Health and Biomedical Sciences at
the University of Wisconsin.


“The ultimate question is whether venison from infected animals, CWD infected
deer, poses a risk to humans. Clearly the first question that needed to be
asked and addressed was whether there was infectivity in muscle.”


Recent findings say there is.


Researchers at the University of Kentucky injected muscle from an
infected deer into the brains of genetically altered mice. The mice
displayed signs of CWD. This is the first time the infectious proteins
blamed for CWD have been found in deer meat.


The finding raises questions about whether eating venison is safe.
Researchers including Aiken say the study is important, but has limits.
For example, he says it doesn’t replicate what would happen in real life.
Plus, he says it’s probably unlikely humans can even get CWD. He says
studies suggest it’s difficult for the disease to jump to other species. Still,
he urges caution. Hunters should get the meat tested before they eat deer
from an area where CWD has been found.


“I, in no way, can advocate the consumption of infected deer, and indeed,
I would suggest due to the limitations of the CW tests, I don’t advocate
the consumption of deer obtained from a CWD endemic area.”


Even if the test comes back negative, Aiken says a negative result isn’t
always accurate, and infected animals in the beginning stages of the
disease can look and act normal.


(Sound of sporting goods store)


John White is a deer hunter from Sheboygan, Wisconsin. He’s in the
hunting section of a nearby sporting goods store. White isn’t too
concerned about Chronic Wasting Disease.


“Not a whole lot of people are worried about it. I mean, when it first
came out, some people were a little leery about it and didn’t want to hunt
that year, but they kinda got over it. I’m not really worried about it being
in the meat at all, because by the time the test comes back I’ll probably
have the deer eaten already and then it’s already too late.”


State wildlife officials say… that’s not a good idea. They recommend that
if you hunt deer in areas where the disease has been found, get the deer
tested before eating it. That message hasn’t changed… since learning the
prions could be in the meat. Some argue… it should change.


John Stauber is with a government watchdog group in Wisconsin, and
is co-author of “Mad Cow USA: Could the Nightmare Happen Here?”
He says officials are keeping quiet about the risk of CWD so they don’t
lose revenue from hunting licenses.


A large portion of state conservation agency budgets are dependent on
fees from hunting licenses. He says all deer that die should be tested for
the disease. Stauber also says CWD is a major human health concern.


“The biggest risk might not be the people who would die from
eating venison, but rather, the people who would die from the
contamination of the blood supply. This is a problem that would unfold
not in days or months or years, but even over decades.”


Stauber says it’s just a matter of time before Chronic Wasting Disease
spreads to people… he says some might even have the disease already,
and not know it.


But researchers like Judd Aiken from the University of Wisconsin say
people shouldn’t over-react.


“People should be concerned, but I don’t want people to panic, either. If
you think you may have consumed venison from infected animals, I don’t
think it’s likely that you’ll ever develop a human prion disease.”


But, Aiken says there’s too much we don’t know about the disease, and
since studies can take years to complete, we might be in the dark for a
while longer.


For the GLRC, I’m Christina Shockley.

Related Links

New Concern Over Chronic Wasting Disease

New research shows the infectious material believed to cause Chronic Wasting Disease can be found in the meat of infected deer. Previously, it was thought that only the brain and central nervous system areas of deer or elk carried the fatal disease. The Great Lakes Radio Consortium’s Christina Shockley reports:

Transcript

New research shows the infectious material believed to cause Chronic
Wasting Disease can be found in the meat of infected animals.
Previously, it was thought that only the brain and central nervous system
areas of deer or elk carried the fatal disease. The Great Lakes Radio
Consortium’s Christina Shockley reports:


The authors of the study at the University of Kentucky say anyone
handling or eating deer infected with CWD may be inadvertently
exposed to the disease.


The research shows that for the first time the mutated proteins – called
prions – can be present in deer muscle.


Officials in states with CWD in wild deer say their message to hunters
won’t change:


Get deer tested for CWD, and don’t eat deer that test positive.


Jim Kazmierczak is Wisconsin’s State Public Health veterinarian.


“What this demonstrates is that the CWD agent does occur in deer
muscle. What it does not address is the question of human
susceptibility to Chronic Wasting Disease.”


Kazmierczak says it’s still unclear how – or if – Chronic Wasting Disease
could be transmitted to humans.


For the GLRC, I’m Christina Shockley.

Related Links

New Chronic Wasting Disease Worries

Officials say a new outbreak of Chronic Wasting Disease
could erupt after a fence was cut at an infected hunting preserve in Wisconsin. The Great Lakes Radio Consortium’s Christina Shockley
reports:

Transcript

Officials say a new outbreak of Chronic Wasting Disease could erupt after a fence was cut at an
infected hunting preserve in Wisconsin. The Great Lakes Radio Consortium’s Christina
Shockley reports:

Authorities say someone intentionally cut a hole in a perimeter fence at the preserve in central
Wisconsin. They say tracks indicate deer had gone in and out of the area through the hole…
before the owner saw it and notified the Department of Natural Resources.


Alan Crossley is with the Wisconsin DNR. He says officials shot deer around the preserve to try
to limit the chance the disease would spread to wild deer.


“We have to try to assess whether any deer escaped from that shooting pen. Then we’re going to
be meeting to talk about okay, should we try to do any additional shooting of deer in a larger area
around that pen.”


Crossley says it’s now even more important to monitor deer near the preserve in the years ahead.
He says it will take time to determine how their overall efforts to combat the disease are working.


So far, CWD has been found in the wild in ten states, including Wisconsin, New York and
Illinois.


For the GLRC, I’m Christina Shockley.

Related Links

Chronic Wasting Disease Spreading in Region

This hunting season there’s a lot more testing for a disease that’s killing deer in parts of the Great Lakes region. The Great Lakes Radio Consortium’s Lester Graham reports:

Transcript

This hunting season, there’s a lot more testing for a disease that’s killing deer in parts of
the Great Lakes region. The Great Lakes Radio Consortium’s Lester Graham reports:


Chronic Wasting Disease is similar to Mad Cow Disease. In this instance, it attacks deer
and elk, causing them to waste away, become disoriented, and eventually die. It’s been
found in captive animals in Minnesota, in the wild deer population in Wisconsin and just
recently a deer in Illinois was found to have Chronic Wasting Disease. Carol Knowles is
with the Illinois Department of Natural Resources. She says about 4,000 samples of
tissue from deer are being taken during the hunting season. They’ll be sent to labs to see
how far the disease has spread in that state. But because the labs are being swamped with samples, it
will take a while before anything is known.


“It will take months to get all of those results back, yes. But we hope to expedite the ones in northern Illinois where we know we had at least one
confirmed case.”


Other Great Lakes states are also testing for Chronic Wasting Disease in their deer herds,
hoping to stop the disease from spreading quickly.


For the Great Lakes Radio Consortium, this is Lester Graham.