Credit Marvin Moriarty / U.S. Fish & Wildlife Service
A little brown bat with white-nose syndrome hangs in Greeley Mine, Vt., in March 2009. The disease is spreading across the country, currently affecting bat populations in 19 states.
Credit U.S. Fish & Wildlife Service
This map shows the prevalence and spread of white-nose syndrome among bats in the eastern U.S. since 2007. Incidences of white-nose syndrome have been spreading west and south.
A disease that has killed more than 5.5 million bats in the eastern United States and Canada is making its way west. White-nose syndrome has now been diagnosed in three Missouri bats — the first confirmed cases west of the Mississippi. And scientists say it won't stop there.