UNIVERSITY PARK, Pa, — The recent announcement by the Pennsylvania Game Commission that it found 25 more wild deer with chronic wasting disease last year underlines the importance of studies being conducted by a team of researchers in Penn State's College of Agricultural Sciences.
With the overarching goal of determining how the always-fatal-to-cervids disease will disburse through the state's free-ranging white-tailed deer herd, the research is aimed at informing the commission's efforts to slow or limit the spread of the disease, according to David Walter, adjunct assistant professor of wildlife ecology.
Often referred to as CWD, chronic wasting disease infects the brain and nervous system of cervids. The illness, which belongs to a group of diseases known as transmissible spongiform encephalopathies, or prion diseases, eventually produces enough damage to the brains of affected animals to result in death. While CWD is similar to so-called mad cow disease in cattle and scrapie in sheep, there is no known relationship between them.
There is no strong evidence, either, that humans can contract CWD, according to the U.S. Centers for Disease Control and Prevention, although the disease is similar to Creutzfeldt-Jakob disease, a rare, fatal syndrome that afflicts people.
Walter, who is assistant unit leader of the Pennsylvania Cooperative Fish and Wildlife Research Unit at Penn State, conducted research from 2007 to 2011 on the spread of the disease in Colorado and Nebraska in free-ranging mule deer and white-tailed deer. Since coming to Penn State in 2012, he has concentrated on the CWD outbreak spreading through deer herds in Virginia, West Virginia, Maryland and Pennsylvania.
Working under Walter's guidance in 2013-14, master's degree student Tyler Evans, now a wildlife biologist with the West Virginia Department of Natural Resources, investigated the geographic coordinates where deer testing positive for CWD were found, and he modeled the likely future spread of the disease in Pennsylvania.