Outbreaks | Equine Disease Communication Center

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.

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West Nile Virus

Waukesha and Green Lake Counties, WI

Alert ID: 673

September 20, 2017

Source: Wisconsin Department of Agriculture, Trade, and Consumer Protection

The Wisconsin Department of Agriculture, Trade and Consumer Protection confirmed three new cases of West Nile Virus. Two horses both unvaccinated 2-year-old Friesians are from Waukesha County; one is a mare, one is a stallion and both began exhibiting clinical signs on 9/8/17 and were sampled on 9/13/17. Clinical signs included difficulty backing, hypermetria, paresis, proprioceptive deficits, hyperesthesia, and reluctance to flex neck. Both are improving and stable with treatment, but one is still neurologic. The third horse is an unvaccinated 3-year-old Standardbred mare from Green Lake County. The mare seemed off and lethargic starting on about 9/1/17 and appeared to improve. A veterinarian was called when signs worsened and samples were taken on 9/11/17. The veterinarian reports that the mare is slowly improving after showing neurologic signs (circling, hypermetria, muscle fasciculations, ataxia). These are confirmed equine WNV cases #17, 18, and 19 for 2017 in Wisconsin

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