Sunday, August 19, 2018

PRO/AH/EDR> Chronic wasting disease, cervid - USA (12): (MN) research

CHRONIC WASTING DISEASE, CERVID - USA (12): (MN) RESEARCH
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International Society for Infectious Diseases
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Date: Thu 16 Aug 2018
Source: MPR News [edited]
<https://www.mprnews.org/story/2018/08/16/chronic-waste-disease-could-spread-faster-than-expected>


Back in March [2018], field biologists caught and collared 109 deer.
They've been tracking them ever since, trying to get a sense of where
and how quickly chronic wasting disease [CWD] could spread.

The findings are still preliminary at this point, but so far, head
researcher Christopher Jennelle said slowing the spread of the disease
might be more complicated than biologists thought. "One of our female
animals has traveled approximately 80 miles [about 129 km]," he said.
"That really blew our minds."

Since the fall of 2016, 17 cases of chronic wasting disease have been
found in the wild deer population of southeastern Minnesota. There's
no cure and no vaccine, although teams of scientists are working on
it. Right now, CWD is 100 percent fatal.

The disease has spread rapidly in other states. In parts of Wisconsin,
an estimated 40-50 percent of deer are infected. And that happened in
a very short time. In 1999, the 1st year the Wisconsin Department of
Natural Resources began monitoring the disease, just 3 animals tested
positive. By 2017, that number had climbed to 600. [The question here
is how many were tested and over what range of distance. It is not
stated, but likely this is hunter or road kills. - Mod.TG]

If the same thing happens in Minnesota's deer herds, the effects could
be dramatic.

The point of this study is to understand how infected deer could
potentially move on the landscape. "When deer reach the 1st year of
life," Jennelle said, "they have to make a decision: whether they want
to remain in their birth range, or if they want to disperse from it
and establish a new adult range elsewhere."

He hoped that since southeastern Minnesota is such a lush habitat for
deer, they wouldn't feel the need to spread out, thus isolating the
disease in one, more easily managed location. But it doesn't seem to
be the case. More young deer than expected choose to disperse, and
they're dispersing farther. Jennelle brought up one young doe that
walked all the way from Forestville State Park to Cannon Falls, at
least 77 miles [about 124 km].

Most deer didn't go that far, but they did go farther than researchers
hoped.

"What does that mean for CWD?" Jennelle said. "Well, it doesn't bode
well. I'll put it that way."

Another surprise, he said, is which deer are traveling. Up until this
point, efforts to slow the disease tended to focus on mature bucks,
which are the most likely carriers of CWD.

"We totally expected our juvenile males to be our movers and shakers
here," he said.

But in this study, does, on average, traveled twice as far as bucks.
So if one is infected, it could spread the disease over a much larger
range.

Jennelle pointed out that the sample sizes are still too small to draw
sweeping conclusions. And there are a lot of things researchers still
don't know about CWD. Infected deer might behave differently than the
healthy ones in Jennelle's study. They could, he said, feel sick and
run-down and decide to stay in their birth range.

The study will provide better data over the next few years.

[Byline: John Enger]

--
Communicated by:
ProMED-mail
<promed@promedmail.org>

[This is an interesting look at movement patterns. However, it is a
small study, and this report does not mention things like weather,
such as storms or winds, droughts (lack of water or forbs), or fires,
possibly prompting an animal to move from its home range. Clearly it
is interesting but needs more study. - Mod.TG

HealthMap/ProMED-mail map:
Minnesota, United States: <http://healthmap.org/promed/p/354>
]

[See Also:
Chronic wasting disease, cervid - USA (11): (WI)
http://promedmail.org/post/20180719.5915033
Chronic wasting disease, cervid - USA (09): (WI)
http://promedmail.org/post/20180604.5838530
Chronic wasting disease, cervid - USA (08): (MO)
http://promedmail.org/post/20180503.5782317
Chronic wasting disease, cervid - USA (07): (WI)
http://promedmail.org/post/20180422.5762794
Chronic wasting disease, cervid - USA (06): (MO,WI)
http://promedmail.org/post/20180420.5757898
2017
----
Chronic wasting disease, cervid - USA (13): (WI) captive deer
http://promedmail.org/post/20171022.5396121
2016
----
Chronic wasting disease, cervid - USA (16): (WI)
http://promedmail.org/post/20161002.4530266
Chronic wasting disease, cervid - USA (04): (WI)
http://promedmail.org/post/20160131.3982305
Chronic wasting disease, cervid - USA (02): (WI)
http://promedmail.org/post/20160120.3950428
2015
----
Chronic wasting disease, cervid - USA (19): (WY,WI)
http://promedmail.org/post/20151209.3852129
Chronic wasting disease, cervid - USA (18): (WI)
http://promedmail.org/post/20151204.3841002
Chronic wasting disease, cervid - USA (15): (WI) comment
http://promedmail.org/post/20151122.3810107
Chronic wasting disease, cervid - USA (13): (WY,WI)
http://promedmail.org/post/20151120.3807796
Chronic wasting disease, cervid - USA (03): (WI)
http://promedmail.org/post/20150628.3470702
2013
----
Chronic wasting disease, cervid - USA (07): (WI)
http://promedmail.org/post/20131205.2093134
Chronic wasting disease, cervid - USA: (WI)
http://promedmail.org/post/20130105.1483535
2012
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Chronic wasting disease, cervid - USA (14): (IA,WI)
http://promedmail.org/post/20121218.1457000
Chronic wasting disease, cervid - USA (13): (WI)
http://promedmail.org/post/20121214.1450977
Chronic wasting disease, cervid - USA (05): (VA, WI) corr. (MO NOT WI)
http://promedmail.org/post/20120326.1081538
2008
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Chronic wasting disease, cervids - USA (07): (WI)
http://promedmail.org/post/20081218.3982
2004
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Chronic wasting disease, cervids - USA (WI)(02)
http://promedmail.org/post/20040319.0765
Chronic wasting disease, cervids - USA (WI)
http://promedmail.org/post/20040312.0690
2003
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Chronic wasting disease, cervids - USA (WI) (03)
http://promedmail.org/post/20030812.1993
Chronic wasting disease, cervids - USA (WI) (02)
http://promedmail.org/post/20030707.1668
Chronic wasting disease, cervids - USA (WI)
http://promedmail.org/post/20030204.0301
Chronic wasting disease, cervids - USA (NE, WI)
http://promedmail.org/post/20030114.0112
2002
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Chronic wasting disease, cervids - USA (WI) (04)
http://promedmail.org/post/20021205.5970]
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