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Disease Alerts

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
Maricopa County, AZ
Alert ID: 999
August 27, 2018

Arizona Department of Agriculture

On August 23, 2018 the Arizona Department of Agriculture confirmed West Nile Virus (WNV) in one horse in Maricopa County. On August 17, 2018 the 18-month old Filly had acute onset of neurologic signs. The horse had moved with other horses from Wyoming on August 14, 2018. No other horses on the property are showing symptoms and this horse is responding to treatment. On August 24, 2018 as second case of WNV was confirmed 18-month Quarter Horse in Maricopa County. The 18-month old gelding had acute onset of neurologic signs. No other horses on the property are showing symptoms and this horse is responding to treatment. These are the first and second WNV cases this year in Arizona.
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