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UT scientist helps confirm link between fungus and bat epidemic
Date:10/31/2011

Bats in North America are under attack. Since 2006, more than a million have been killed. Little has been done to save them, because there has not been enough evidence to implicate the suspectuntil now.

A study has discovered that the fungus Geomyces destructans is the causal agent of White-nose Syndrome (WNS), the fungal disease decimating the bat population.

The study is coauthored by Justin Boyles, a post-doctoral research associate in ecology and evolutionary biology at the University of Tennessee, Knoxville, and a team led by David Blehert at the U.S. Geological Survey (USGS) National Wildlife Health Center together with Jeffrey Lorch, a graduate student at the University of Wisconsin, Madison. WNS is dubbed so because affected bats develop halos of white fungus around their muzzles. The symptoms of WNS include loss of body fat, unusual winter behavior, lesions to the wing membranes, and death.

The findings are published in the latest edition of Nature.

G. destructans has been thought to be the likely culprit, because the skin lesions characteristic of the disease are associated with colonization of the fungus. Still, the role of G. destructans in WNS has remained controversial, because evidence proving the fungus as the primary cause of the disease was lacking.

"Many assumed that fungal infections in mammals only occur if some other pathogen has already weakened the immune system," said Boyles. "Additionally, the recent discovery that G. destructans commonly colonizes the skin of bats in Europe with no major die-offs generated speculation that other unidentified factors are the primary cause of WNS."

To put the speculation to rest, the researchers set up an experiment to see if G. destructans causes WNS. They housed healthy little brown bats in a laboratory under hibernation conditions and treated them with G. destructans. Exposure to the fungus caused WNS in the healthy bats. They also found
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Contact: Whitney Heins
Wheins@utk.edu
865-974-5460
University of Tennessee at Knoxville
Source:Eurekalert

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