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Mosquito-Borne Disease in Ontario Horses: EEE, WNV Cases Confirmed

September 11, 2018
Posted by Erica Larson

Officials have confirmed six EEE cases and one WNV case in Ontario horses during late August and early September.

Topics: Diseases and Conditions, Eastern Equine Encephalitis (EEE), Neurologic Disease, West Nile Virus (WNV)

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mosquito-borne disease in Ontario horses

Both EEE and WNV are transmitted to horses via bites from infected mosquitoes. | Photo: iStock

The Ontario Ministry of Agriculture, Food, and Rural Affairs (OMAFRA) has confirmed additional cases of Eastern equine encephalitis (EEE) and West Nile virus (WNV) in horses in that province, the Equine Disease Communication Center (EDCC) reported.

“Between Aug. 14 and Sept. 6, OMAFRA received confirmation of six more cases of Eastern equine encephalitis in the following areas: four in the Regional Municipality of Niagara, one in the Regional Municipality of Hamilton-Wentworth, and one in Haldimand County,” the EDCC said. “The total number of cases for the year is eight. Affected horses have ranged in age from 1.5 months to 18 years with six mares, one gelding, and one male affected. All horses showed onset of severe neurological signs within 24 hours and all were euthanized. All were unvaccinated except one, which was incompletely vaccinated.”

Then, on Sept. 6, OMAFRA confirmed Ontario’s first case of WNV for 2018 in a horse from Middlesex County

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Written by:

Erica Larson

Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.