Once a horse is infected with equine herpesvirus-1 (EHV-1), the dormant virus resides in the horse's nervous system, where it can reactivate when the horse's immune system is compromised by stress or illness. Nicola Pusterla, DVM, PhD, Dipl. ACVIM, and his colleagues at the University of California, Davis, wondered if stress caused by transporting horses would reactivate a latent infection.
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