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

Weld County, CO

Outbreak Identifier: 4781

Alert ID: 2147

July 31, 2021

Confirmed Case(s) - No Quarantine

Source: Colorado Department or Agriculture

Number Confirmed: 1;
Clinical Signs: Neurologic Signs; Vaccination Status: Unvaccinated;
Notes: A horse residing in Weld County has been diagnosed with West Nile Virus (WNV), marking Colorado’s first confirmed equine WNV case in 2021. The horse, which had not been vaccinated against WNV, developed acute neurological signs on July 24, 2021 and is currently recovering. For more information go to: WNV Factsheet

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