For first time, fungus that causes white-nose syndrome in bats detected in Wyoming

Little brown bats found dead in western North Dakota died of white-nose syndrome.

CHEYENNE — Wyoming wildlife researchers working at Fort Laramie National Historic Site in Goshen County have detected the fungus that causes white-nose syndrome in bats, the first such finding in the state. Testing of skin-swab samples collected from the wing of a little brown bat confirmed the presence of the fungus Pseudogymnoascus destructans (Pd for short).

The bat was captured on May 16 during proactive surveys for WNS by Wyoming Natural Diversity Database field biologists from the University of Wyoming, working in a project funded by the National Park Service (NPS) for white-nose syndrome surveillance and response. They sent separate samples in May from Fort Laramie bats to Colorado State University’s Veterinary Diagnostic Laboratory and the U.S. Geological Survey’s (USGS) National Wildlife Health Center for independent testing.

The discovery does not mean the bat confirmed with fungus has white-nose syndrome. But the fungus detection in Wyoming signals the continued spread west of a pathogen that has killed millions of bats in the eastern and midwestern U.S. since it first appeared in New York state in 2006. Scientists believe humans accidentally brought the Pd fungus from Eurasia to the U.S. To date, the disease has been found in 32 states and seven Canadian provinces.

Further testing is underway on tissue samples from Fort Laramie bats to confirm if they have WNS. The Fort Laramie finding follows another first instance earlier in May in South Dakota, where the Wyoming field team detected Pd fungus on five bats in Badlands National Park.

“This is a saddening discovery. Bats are important species because they are incredible predators of insects,” said Tim Woolley, the Wyoming Game & Fish Department’s statewide Wildlife and Habitat Management supervisor. “As voracious insectivores, bats are vital for healthy ecosystems and contribute at least $3 billion annually to the U.S. agricultural economy through pest control and pollination.”

Wyoming and the Park Service are now implementing state and national response plans within the state. The state’s strategy is to increase coordinated management by limiting access to sites where bats roost and hibernate, and by broadening surveys of those sites to monitor any spread of the fungus. Wyoming Game & Fish has been sampling for Pd fungus at known bat roosts since 2014 with no previous detections. The department also implemented strict decontamination measures previously for field personnel who survey bat species, per national standards. (The national WNS plan is at

“This detection reveals that Pd is moving even further into the ranges of western bat species,” said Jeremy Coleman, national white-nose syndrome coordinator for the U.S. Fish and Wildlife Service.

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