Massachusetts Confirms Two Neurologic Equine Herpesvirus Cases

Massachusetts has two confirmed cases of neurologic equine herpesvirus and six suspect cases.
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Massachusetts Middlesex and Plymouth Counties map

In Massachusetts, Middlesex County had one confirmed case of EHM and six suspect cases at one boarding facility, and Plymouth County had one confirmed case of EHM.

The Massachusetts state veterinarian confirmed two cases of neurologic equine herpesvirus, one each at boarding facilities in Middlesex and Plymouth Counties. They also reported six suspect neurologic equine herpesvirus cases at the same boarding facility in Middlesex County.

In Middlesex County, a horse at a boarding facility had onset of clinical signs on May 5 that included being febrile and neurologic. The horse was confirmed with neurologic equine herpesvirus (also known as equine herpesvirus myeloencephalopathy or EHM) on May 11. The horse was euthanized.

Six other horses at the Middlesex boarding facility were suspected of having neurologic equine herpesvirus.

A gelding at a boarding facility in Plymouth County was confirmed positive for neurologic equine herpesvirus on April 28. The horse was euthanized.

For a Fact Sheet on neurologic equine herpesvirus, visit this page.

Information for this report was provided by the Equine Disease Communication Center.

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