Prevalence of antibodies against Saint Louis encephalitis and Jamestown Canyon viruses in California horses

Dana M. Nelson, Ian Gardner, Robert F. Chiles, Udeni B. Balasuriya, Bruce F. Eldridge, Thomas W. Scott, William Reisen, Nigel J Maclachlan

Research output: Contribution to journalArticle

8 Scopus citations


Jamestown Canyon (JC) and Saint Louis encephalitis (SLE) viruses are mosquito-transmitted viruses that have long been present in California. The objective of this study was to determine the seroprevalence of these two viruses in horses prior to the introduction of West Nile (WN) virus. Approximately 15% of serum samples collected in 1998 from 425 horses on 44 equine operations horses throughout California had serum antibodies to JC virus, whereas antibodies were not detected to SLE virus. The results indicate that horses in California were commonly infected prior to 1998 with mosquito-transmitted Bunyaviruses that are identical or closely related to JC virus, but not with SLE virus. The different seroprevalence of SLE and JC viruses in horses likely reflects the unique ecology of each virus, and it is predicted that WN virus will have a wider distribution in California than closely related SLE virus.

Original languageEnglish (US)
Pages (from-to)209-215
Number of pages7
JournalComparative Immunology, Microbiology and Infectious Diseases
Issue number3
StatePublished - May 2004



  • Arboviruses
  • Horses
  • Jamestown Canyon virus
  • Saint Louis encephalitis virus

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Immunology
  • Microbiology
  • veterinary(all)

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