Distribution and relevance of equine herpesvirus type 2 (EHV-2) infections

Archives of Virology
K BorchersH Ludwig

Abstract

Equine herpesvirus type 2 (EHV-2) is a slow-growing, cytopathogenic gammaherpesvirus, which is suggested to be ubiquitous in the equine population. However, its precise role as a pathogen and its tissue tropism remains uncertain. To estimate the prevalence of EHV-2 in Germany and to investigate the possible pathogenicity of the virus, peripheral blood leucocytes (PBL) from 172 horses were examined for EHV-2 DNA by a sensitive and specific nested PCR based on the EcoRI-N genomic fragment and by classical cocultivation. PBL samples from 51% of the horses were positive by PCR and virus was isolated from 31% of the horses by cocultivation. However, almost all animals were seropositive for EHV-2. This may indicate that PBL do not harbour EHV-2 indefinitely after infection. Furthermore, a correlation between clinical signs and EHV-2 as a causative agent could not be determined. Nevertheless, the prevalence of virus was high among horses with upper respiratory tract disease, abortion and severe ataxia. The products of the second round of the PCR reactions showed size polymorphism. Sequencing of the products revealed that these size differences were due to repetition of the motif (AGACAGGGGCCATGCTGGC) between 9-16 times depending on th...Continue Reading

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