Horse Disease Reports for Michigan and Oklahoma

Two EEE deaths in Michigan horses and Oklahoma's third case of equine WNV were reported.

Michigan Equine EEE Deaths Reported

The Michigan Department of Agriculture and Rural Development has received confirmation of two additional cases of Eastern equine encephalitis (EEE). Both of the horses were from Marquette County and were unvaccinated. The cases are as follows: a 25-year-old Quarter Horse gelding that developed a sudden onset of drooling, stumbling, blindness and seizures; and an 11-year-old Quarter Horse gelding from a different farm in Marquette County that was circling and stumbling. Both horses were euthanized. No quarantines were placed. 

These horses bring the total number of reported cases of EEE in Michigan for 2017 to six: two from Marquette County, two from Clare County, one from Roscommon County, and one from Wexford County.

Oklahoma’s Third Equine WNV Case 2017

The Oklahoma Department of Agriculture, Food and Forestry reported the third case of equine West Nile virus (WNV) or Oklahoma in 2017. The adult Quarter Horse mare located in Kay County was showing moderate neurologic signs. Vaccination history is unknown. A quarantine was not issued. For more information visit

The Equine Disease Communication Center (EDCC) works to protect horses and the horse industry from the threat of infectious diseases in North America. The communication system is designed to seek and report real time information about disease outbreaks similar to how the Centers for Disease Control and Prevention (CDC) alerts the human population about diseases in people.

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