Equine herpesvirus-4 kinetics in peripheral blood leukocytes and nasopharyngeal secretions in foals using quantitative real-time TaqMan PCR

Nicola Pusterla, Christian M. Leutenegger, William D Wilson, Johanna L Watson, Gregory L. Ferraro, John E Madigan

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

Based on the hypothesis that the viral load of cells infected with EHV-4 will likely change during the course of disease, TaqMan PCR was used to investigate and characterize the kinetics of EHV-4 viral DNA load (glycoprotein B gene) and transcriptional activity (glycoprotein B and latency-associated transcripts) in peripheral blood leukocytes (PBLs) and nasopharyngeal secretions (NSs) collected from 11 foals during a field outbreak of respiratory disease. The EHV-4 DNA load in PBLs was low and of short duration after onset of clinical signs. In contrast, the EHV-4 load in NSs remained high for the majority of the foals over a period of 4 weeks. Viral replication determined by detection of mRNA expression of the structural glycoprotein B was detected only in NSs during the first 7 days after onset of clinical signs for most foals. The majority of foals expressed latency-associated transcripts in NS sonly during the first 7 days after onset of clinical signs. Persistence of the expression of latency-associated transcripts in NS, as a reflection of a latent viral state, was not documented during the 28-day study period. Based on these results, it was concluded that lytic infection with EHV-4 can be diagnosed either by high EHV-4 DNA load of glycoprotein B gene or by detection of transcriptional activity of glycoprotein B.

Original languageEnglish (US)
Pages (from-to)578-581
Number of pages4
JournalJournal of Veterinary Diagnostic Investigation
Volume17
Issue number6
StatePublished - Nov 2005

Keywords

  • Equine herpesvirus-4
  • Nasopharyngeal secretions
  • Peripheral blood leukocytes
  • TaqMan PCR

ASJC Scopus subject areas

  • Microbiology
  • veterinary(all)

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