Maryland horse euthanized after EHV-1 case in Anne Arundel County

A 19-year-old Thoroughbred gelding at a boarding facility in Anne Arundel County, Maryland, tested positive for equine herpesvirus-1 on March 9 and was euthanized, according to an EDCC Health Watch report republished by The Horse. One additional horse is suspected positive, and 29 horses have been exposed. The case comes after Maryland had already imposed, and then on February 1, 2026 lifted, temporary intrastate equine certificate of veterinary inspection requirements tied to a broader multi-state EHV-1 outbreak. (thehorse.com)

Why it matters: For equine veterinarians and practice teams, the case is a reminder that EHV-1 remains an active surveillance and biosecurity issue even after statewide movement restrictions ease. Maryland requires veterinarians to report reportable equine diseases to the State Veterinarian within 48 hours, and both AAEP and USDA guidance emphasize immediate movement controls, isolation, surveillance, and testing when neurologic disease is suspected. Vaccination can help reduce respiratory disease and shedding, but current vaccines are not considered protective against the neurologic form, EHM. (mda.maryland.gov)

What to watch: Watch for whether Maryland reports additional linked cases or reinstates tighter movement or event requirements if exposure investigations expand. (mda.maryland.gov)