White-nose syndrome confirmed in South Carolina bat

NY Bat with white fungus on muzzle and wings (USGS)

PICKENS, S.C. (WCIV) -- The S.C. Department of Natural Resources has confirmed that a disease that has killed millions of bats in eastern North America is now in the Palmetto State.

A dead bat found at Table Rock State Park in northern Pickens County has been confirmed to have white-nose syndrome (WNS), which spreads mainly through bat-to-bat contact and has not been found to infect humans or other animals.

"We have been expecting WNS in South Carolina," said Mary Bunch, wildlife biologist with the S.C. Department of Natural Resources (DNR) based in Clemson. "We have watched the roll call of states and counties and Canadian provinces grow each year since the first bat deaths were noted in New York in 2007."

SCDNR estimates of bat mortality from WNS in North America range from 5.7-6.7 million bats since the new pathogen was first discovered.Table Rock's bat colony is in a remote portion of the park not accessible to the public, and the discovery of the white-nose syndrome bat is not a threat to park visitors' health and safety.With the addition of South Carolina, WNS has now been confirmed in 21 states and five Canadian provinces.Currently there is no cure or effective treatment for WNS, and mortality in some species, such as the small tri-colored bat, has exceeded 98 percent.

Bats have very low reproductive rates so recovery from losses takes a long time. Formerly common bats are becoming rare, and some rare bats may be lost. The fungus grows best in a cool moist environment, the same places bats go to hibernate.Bat species that hibernate in mines or caves are susceptible to WNS. In South Carolina, those species are big brown bat, little brown bat, Eastern small-footed bat, Northern long-eared bat, tricolored bat and Southeastern bat.In the Southeast, there are some other colonial, non-hibernating, bats in which WNS has not been detected, such as the free-tailed bat and the evening bat.While WNS is not harmful to humans, scientists believe it is possible for humans to transport fungal spores on clothing and gear. In 2009, the U.S. Fish and Wildlife Service advised cavers and researchers to curtail caving activities and implement decontamination procedures in an effort to reduce the spread of WNS. The fungus cannot be killed simply by washing clothing.According to reports from SCDNR, bats play a critical role in maintaining healthy ecosystems and have an enormous impact on pest control, benefiting the economies of both forestry and agriculture in the United States. For example, the one million little brown bats that have already died due to WNS would have eaten between 660 and 1,320 metric tons of insects in one year. A recent study published in Science estimates that insect-eating bats provide a significantpest-control service, saving the U.S. agricultural industry at least $3 billion a year."The news that white-nose syndrome has been confirmed in South Carolina is devastating for these very important mammals," Bunch said. "We will continue to work closely with our partners to understand the spread of this deadly disease and to help minimize its impacts to affected bat species."