West Nile virus emergence and persistence in Los Angeles, California, 2003-2008

Jennifer L. Kwan, Susanne Kluh, Minoo B. Madon, William Reisen

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

West Nile virus (WNV) invaded Los Angeles in September 2003, and during the subsequent five-year period followed a pattern of amplification, subsidence, and resurgence. Enzootic transmission was tracked by abundance and infection incidence in Culex pipiens quinquefasciatus and Cx. tarsalis and by seroprevalence in peridomestic passerine birds, infection in dead birds, and seroconversions in sentinel chickens. Culex p. quinquefasciatus served as the primary vector of WNV, with gravid traps serving as the best sampling method and the most consistent indicator of viral activity. Spatial scan statistics applied to mosquito infection and positive dead bird data delimited three major clusters of WNV transmission, with introduction occurring in the Los Angeles Basin, and amplification and dispersal events carrying transmission to the San Fernando and Santa Clarita valleys. Los Angeles experienced major epidemics in 2004 and 2008, providing a unique opportunity to investigate specific patterns of enzootic amplification preceding epidemics.

Original languageEnglish (US)
Pages (from-to)400-412
Number of pages13
JournalAmerican Journal of Tropical Medicine and Hygiene
Volume83
Issue number2
DOIs
StatePublished - Aug 1 2010

ASJC Scopus subject areas

  • Parasitology
  • Infectious Diseases
  • Virology

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