The Michigan Department of Natural Resources and Michigan State University Diagnostic Center for Population and Animal Health have announced the death of deer in Ionia and Branch counties was due to epizootic hemorrhagic disease (EHD), bringing the total number of counties where EHD has been confirmed to eight.
The two organizations have confirmed EHD in six additional counties: Barry, Calhoun, Cass, Clinton, Eaton and Montcalm. There has been a nationwide increase of EHD outbreaks due to the extended hot and dry conditions.
The often-fatal viral disease, found in wild ruminants, causes extensive internal bleeding within deer and is transmitted by a midge, or type of biting fly. A constant characteristic of the disease is its sudden onset. Deer lose their appetite and fear of humans, grow progressively weaker, salivate excessively and finally become unconscious. Due to a high fever, infected deer often are found sick or dead along or in bodies of water. There is no evidence that humans can contract the EHD virus.
EHD outbreaks killing deer in Michigan have occurred in isolated areas almost every year since 2006. Prior to 2006, EHD outbreaks in Michigan occurred in 1955 and 1974. The estimated mortality has varied from 50 to 1,000 deer per year in the affected areas.
"We are seeing a large die-off of deer in local areas. To date we have over 900 reports of dead deer across all counties," stated Tom Cooley, DNR wildlife biologist and pathologist. "Although it is difficult to see so many dead deer, this is still a localized issue and the regional deer population should not be impacted."
The DNR would like to remind hunters that they may not see as many deer in the areas where EHD is occurring. Deer numbers in the affected areas should rebound within a few years.
There is no known effective treatment for, or control of, EHD. Where EHD is more common, deer have built up antibodies to the disease, and population recovery does not take long. Michigan deer do not have the benefit of these antibodies. Losses may be severe but are typically restricted to localized areas. Population recovery may take longer than has been experienced in other states.
