Abstract
An outbreak of neurologic disease associated with serologic evidence of equine herpesvirus type 1 (EHV‐1) infection occurred in a herd of 46 riding school horses. Ataxia and paresis were observed in 14 geldings and 5 barren mares. Eight affected horses had distal limb edema, 1 horse had a head tilt, and 3 others had urinary incontinence. Other clinical signs included fever, depression, and inappetance in 30 horses. Seven horses with neurologic signs were treated with acyclovir. Serum neutralizing antibody titers against EHV‐1 increased 4‐fold between acute and convalescent samples or exceeded 1: 256 in 19 of 44 horses, confirming recent infection. A significantly greater proportion of horses that seroconverted were mares (P= .014). Of the 19 horses exhibiting ataxia and paresis, 17 made a complete recovery, 1 made a partial recovery, and 1 was euthanized.
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