Direct prion transmission likely predominates during breeding season, but indirect interactions may be more common at socially attractive sites such as scrapes, the authors say.
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Washtenaw County is in the southeastern part of Michigan's Lower Peninsula and is home to Ann Arbor.
The county is in the west-central part of Michigan's Lower Peninsula.
Kaufman County is in the northeastern part of the state, just outside of Dallas.
Baiting and feeding encourage deer to congregate around a shared food source, risking the transmission of CWD through direct contact or environmental contamination.
The county is in southwestern Indiana, on the border with Illinois and Kentucky, both of which are CWD-positive.
The two adult female elk were found dead in January and early February, respectively, at the Dell Creek feeding ground.
The severely emaciated deer was found dead on private property located more than 10 miles away from any other CWD-positive cases.
The two 2.5-year-old bucks in Cleburne County, located within a quarter-mile of each other, and a 3.5-year-old buck in Baxter were harvested during the hunting season.
Nebraska conducts CWD surveillance in 4 to 7 regions each year, rotating to a different part of the state each season.
Authorities detected the cases in Concordia, St Landry, and Tangipahoa parishes after tracing them back to a CWD-positive deer farm in Jefferson Davis Parish.