A fungus that leads to a deadly disease that has killed almost seven million bats in the US is continuing its spread westwards, results have shown.
Officials said the disease had been confirmed in Arkansas after samples tested positive for the fungus known to cause white-nose syndrome (WNS).
To date, there is no known vaccine or antidote against the disease.
WNS was first detected in New York State in 2006 and has since spread to 22 states and five Canadian provinces.
The latest positive results came from swab samples taken from hibernating bats in two cave in Arkansas.
The testing was part of a national study, funded by the US National Science Foundation, being carried out by researchers from the University of California Santa Cruz and North Arizona University.
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