A cases of white-nose syndrome, an often-fatal disease of hibernating bats, has been detected in Jefferson County for the first time this year. 

White-nose syndrome is caused by a fungus which attacks the skin of hibernating bats and damages their wings, making it difficult to fly. Infected bats often leave hibernation too early, which causes them to deplete their fat reserves and become dehydrated or malnourished. 

It does not affect humans, livestock, or other wildlife. 

This disease has caused bat populations to decline in many parts of North America. The first case in the western United States was confirmed in King County in 2016. Since then, the Washington Department of Fish and Wildlife has confirmed more than 150 cases in at least four different bat species throughout Chelan, Kittitas, Pierce, Snohomish, and now Jefferson County.

“It’s discouraging to see white-nose syndrome spreading among local bat populations, but we will continue our proactive measures to survey the spread and test the efficacy of emerging disease treatments,” said Abby Tobin, bat species lead for the Department of Fish and Wildlife.

The department urges people to not handle wild animals, especially if they appear sick or dead. Even though the fungus is primarily spread from contact between bats, humans can unintentionally spread it, as well. People can carry fungal spores on clothing, shoes, or recreational equipment. If you find a sick, dead, or strangely-acting bat, do not approach it. Report your sighting to 360-902-2515. 

A map showing fungus and white-nose syndrome detections in Washington state is available online at wdfw.wa.gov/bats.