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Isolation of Equine Herpesvirus-5 from Blood Mononuclear Cells of a Gelding

Correspondence: ¹ Corresponding Author: N James MacLachlan, Department of Pathology, Microbiology, and Immunology, School of Veterinary Medicine, One Shields Avenue, University of California, Davis, CA 95616, njmaclachlan{at}ucdavis.edu

Horses are commonly infected by herpesviruses, but isolation of equine herpesvirus-5 (EHV-5) has only infrequently been reported. We describe the isolation and characterization of a strain of EHV-5 from the blood mononuclear cells of a healthy adult horse in California. The virus was initially identified by EHV-5 specific polymerase chain reaction (PCR), and it caused lytic infection of cultured rabbit kidney cells only after repeated serial passage. Virions with characteristic herpesvirus morphology were readily demonstrated in cell culture lysate by transmission electron microscopy. A portion of the glycoprotein B gene of this strain of EHV-5 had 99% identity to the published EHV-5 sequence, and it was clearly distinguishable from other EHV (1–4) by virus-specific PCR assays. Prevalence of EHV-5 infection in a group of young racehorses was estimated at 64% using the EHV-5 specific PCR on nasopharyngeal secretions.

Key Words: Electron microscopy • equine herpesvirus-5 • PCR • virus isolation

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