Second Maryland Horse Tests Positive for EHV-1

Two Maryland premises are now quarantined after horses residing at the facilities tested positive for neurologic EHV-1.
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A horse that was at the same breeding facility as a Montgomery County, Maryland, horse that was recently diagnosed with the neurologic form of equine herpesvirus-1 (EHV-1) has tested positive for virus, the Maryland Department of Agriculture (MDA) reported April 17..

The second horse, which is still at the breeding facility, had no signs of disease and was diagnosed via lab test result. Both EHV-1-positive horses are under care by private veterinarians and are in strict isolation, according to protocol.

The index horse had been at the breeding facility for more than two weeks before returning home on April 13. While at the breeding facility and during the first day home, the horse exhibited no signs of illness. On April 14 the horse began showing mild respiratory and neurologic signs and was examined by a private veterinarian, who reported the suspected neurologic illness to the MDA, as is required by law. Laboratory tests conducted by MDA confirmed the diagnosis. Following disease investigation protocol, MDA tested horses that were in close contact with the sick horse at the breeding facility. That investigation discovered the second positive horse.

All horses that were exposed to the two positive horses are currently free of clinical signs and are being monitored daily. All appear healthy. Both farms will remain under quarantine to ensure the virus is contained. As of April 17, MDA believes the virus is contained to these two farms and is not aware of any other EHV-1 cases in the state

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