Since the outbreak of two deadly drought-related wildlife diseases in August, there have been more than 500 reports of sick or dead deer in Eastern Washington.
That number will likely grow, said Michael Atamian, the district biologist for the Washington Department of Fish and Wildlife, as more reports are cataloged by agency staff. A spate of cold weather, however, may mean the worst of the viral outbreak is over.
Both bluetongue and epizootic hemorrhagic disease are transmitted via biting Culicoides gnats. The disease can’t spread to humans, although wildlife officials recommend not eating animals that are obviously sick.
“We had a hard frost, at least at my house at Chewelah last night,” northeast district wildlife biologist Annemarie Prince said Friday. “I’m hoping that will stop it.”
In August, reports of dead or dying deer started coming in from across the region, Atamian said. WDFW biologists collected samples and confirmed the presence of both diseases. Both bluetongue and EHD occur more frequently during drought years, possibly because deer concentrate around available water sources, which is also the breeding habitat for the gnats. White-tailed deer are most susceptible to these diseases and usually die within two to four days, but they can survive up to two weeks, according to a WDFW statement. Mule deer do not typically die from these diseases, although there have been a handful of documented deaths this year.
There have also been reports of bluetongue outbreaks in bighorn sheep herds. As of late August, at least 20 bighorns had been found dead in British Columbia’s Grand Forks area, and there have been reports of sick and dead bighorn sheep in the Okanogan region, Atamian said.
The last large outbreak occurred in 2015, killing several hundred whitetail in Eastern Washington.
It’s too soon to tell how this year’s outbreak compares to the 2015 one, Atamian said, although geographically it’s just as widespread.
“What I’ve been telling most of our hunters, the geographic extent of this is pretty widespread in my district,” he said. “How severe it is in any of those places is not consistent.”
Tracking the extent of the disease is complicated by the fact that WDFW relies on citizen reports. This means that higher population areas, like around Spokane, receive more reports, Atamian said. At the same time, the public and the agency are more aware of the disease since the 2015 outbreak, possibly increasing the level of reporting.
“Our public is more educated because of the 2015 outbreak,” Atamian said.
