EHM in Arizona: Another Case Confirmed in Maricopa County

A 20-year-old Quarter Horse mare developed severe neurologic signs on March 25 and was euthanized. This case is not associated with the one reported in the same county on March 25.

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ehm in arizona
In many horses, the first or only sign of EHV-1 infection is fever, which can go undetected. | Photo: The Horse Staff

The Equine Disease Communication Center (EDCC) reported March 28 that another horse in Maricopa County, Arizona, has been diagnosed with equine herpesvirus myeloencephalopathy (EHM), the neurologic form of equine herpesvirus-1 (EHV-1).

A 20-year-old Quarter Horse mare developed severe neurologic signs on March 25 and was ultimately euthanized, the EDCC said. Test results confirmed EHV-1 infection on March 27.

The Arizona Department of Agriculture said this case is not associated with the one confirmed in the same county earlier this week,  the EDCC added

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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.

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