Multiple Equine EEE Cases Reported

Cases of Eastern equine encephalitis (EEE) were reported in Wisconsin, New York, Texas and Ontario, Canada.
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Cases of Eastern equine encephalitis (EEE) were reported in Wisconsin, New York, Texas and Ontario, Canada.

The following information about Eastern equine encephalitis (EEE) was created from information reported by the Equine Disease Communication Center (EDCC) on September 4.

Lake County, Wisconsin

The Wisconsin Department of Agriculture, Trade and Consumer Protection reported that a 12-year-old warmblood mare had onset of clinical signs on August 19 that included fever, muscle fasciculations and recumbency. The mare was confirmed with EEE on August 23. The mare had no history of vaccination. This was the third case of EEE in Wisconsin for 2019.

Montgomery County, Texas

The attending veterinarian reported a 14-year-old Appaloosa gelding began showing clinical signs on August 26 that included circling and showing signs of encephalopathy. The gelding was euthanized. The gelding was rescued six weeks prior to presentation with clinical signs with no vaccination history.

Ontario and Oswego Counties, New York

The New York State Department of Agriculture and Markets reported two cases of EEE in Oswego County and one in Ontario County. The first EEE case in Oswego County was in a 16-yar-old mare with onset of clinical signs on August 27. The mare was mentally dull and recumbent. She was euthanized. The mare was unvaccinated. The second EEE case in Oswego county was in a gelding that had onset of lcinical signs on August 25 that included staggering, high fever, blindness, and recumbency. The horse was euthanized.

A yearling filly in Ontario County had onset of clinical signs on August 27 that included ataxia, fever and recumbency. The filly was euthanized. She was unvaccinated.

The Ontario Ministry of Agriculture, Food and Rural Affairs reported that a 6-year-old mare had onset of clinical signs of EEE on August 15 that included ataxia, circling, fever, head pressing, stumbling, and an absent menace response. The mare was confirmed with EEE on August 24. She was euthanized.

Greater Sudbury County and the United Counties of Leeds and Grenville, Ontario, Canada

The Ontario Ministry of Agriculture, Food and Rural Affairs reported that a 6-year-old mare in Greater Sudbury County had onset of clinical signs on August 15 that included ataxia, circling, fever, head pressing, and an absent menace response. The mare was confirmed with EEE on August 24 and was euthanized.

An 18-year-old Thoroughbred gelding in the United Counties of Leeds and Grenville had onset of clinical signs on August 20 that included lethargy, convulsions and paddling. The gelding was confirmed with EEE on August 28 and was euthanized.

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