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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CWD has been confirmed at deer-breeding facilities in Hamilton and Frio counties.
The detections span locations in three counties, with cases in two identified through postmortem testing.
For the first time, chronic wasting disease has been detected in white-tailed deer in Manitoba—previous detections were in mule deer.
Testing done on samples from about 5,000 deer harvested in last year's hunting seasons in Iowa revealed that 84 deer were positive for CWD.
In North Carolina, officials confirm the first case detected outside of the state's surveillance area.
Trained dogs correctly identified CWD in 8 of 11 CWD-positive samples and had an average false-positive rate of 13%.
Earlier this month, officials confirmed CWD in Sheboygan County, and in January CWD was detected for the first time in Waupaca County.
The shortage is leading to delays in the testing of deer samples submitted by hunters.
The deer was a 2-year-old doe harvested by a hunter in the northwestern part of the county.
A buck brought to a taxidermist represents the first CWD case in Fairfax County, Virginia.
