Abstract
Aim. To report the first isolation of equine herpesvirus 5 (EHV-5) in New Zealand as part of a study of equine respiratory viruses in New Zealand. Methods. Nasal swabs and peripheral blood leukocytes were collected from 114 foals and adult horses, inoculated on to equine fetal kidney, rabbit kidney and Vero cell lines and observed for cytopathic effect. EHV-5 isolates were identified using an EHV-5 specific polymerase chain reaction. All samples positive for EHV-5 were also checked for the presence of EHV-2, EHV-1 or EHV-4 DNA using published type-specific primers. The polymerase chain reaction results were further confirmed by dot blot and Southern hybridisation with specific DIG-labelled probes. Results. EHV-5 was isolated from nasal swabs or peripheral blood leukocytes of 38 out of 114 horses sampled. From horses sampled more than once, EHV-5 was often isolated on more than one occasion. Most of the horses were infected with both EHV-2 and EHV-5 viruses. It was not possible to make an association between EHV-5 isolation and the presence of respiratory disease. Conclusion. EHV-5 is present in the New Zealand horse population. The exact role it plays in causing, or predisposing to, respiratory disease remains to be elucidated.
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