According to this press release:
Scientists have proven that the fungus Geomyces destructans causes white-nose syndrome, a fast-spreading and highly lethal disease of bats.
Research published today (Wednesday, Oct. 26) in the journal Nature provides the first direct evidence that this fungus is responsible for a disease that is decimating bats in North America.
Research at the USGS National Wildlife Health Center in Madison, by scientists from the U.S. Geological Survey, the University of Wisconsin-Madison, and other institutions, showed that 100 percent of healthy little brown bats exposed to G. destructans developed white-nose syndrome while hibernating in captivity.
The study fulfilled established criteria for proving that a microbe causes an infectious disease: A pure culture of a suspected pathogen is able to infect a host plant or animal, which then develops the clinical signs of the disease, and then the pathogen is re-isolated from the experimentally infected host species.
White-nose syndrome is a skin infection that often begins around the muzzle, but the exact mechanism of mortality is unknown.
“By identifying the causative agent of white-nose syndrome, this study provides information that is critical for developing management strategies to preserve vulnerable bat populations and the ecosystem services that they provide in the U.S. and Canada,” says study author David Blehert, a microbiologist at the Wildlife Health Center, and a honorary fellow at the School of Veterinary Medicine at UW-Madison.