INDIANAPOLIS (AP) — Indiana wildlife biologists are investigating reports of sick deer to determine if they have an often fatal illness that's believed to be worse during drought years.

The Department of Natural Resources says epizootic hemorrhagic disease, or EHD, is a viral disease transmitted by insects that typically occurs during late summer and early fall. Deer with EHD may appear depressed or feverish and seek comfort in or around water. Other signs can include blue-tinted tongue or eyes, tongue ulcers, sloughed hooves and an eroded dental pad.

The DNR says the most intense outbreaks appear to be in Morgan and Putnam counties but suspected infections have been reported in nine other counties. Test results from a sample taken from one deer are expected back within two weeks.