Effects of water quality on the vector competence of Culex tarsalis (Diptera: Culicidae) for western equine encephalomyelitis (Togaviridae) and St. Louis encephalitis (Flaviviridae) viruses

Journal of Medical Entomology
W K ReisenS B Presser

Abstract

The effects of water quality during immature development on the vector competence of adult female Culex tarsalis Coquillett for western equine encephalomyelitis (WEE) and St. Louis encephalitis (SLE) viruses was evaluated during 6 field and 4 laboratory experiments. Immatures of the Bakersfield Field Station laboratory strain and the F1 progeny of field-collected females were reared in the field or laboratory and then infected by feeding on pledgets, after which remnants (head, thorax, abdomen), legs, and salivary secretions were tested for WEE or SLE virus to estimate infection, dissemination, and transmission rates, respectively. Although the salt content of the 6 larval habitats varied markedly (range, alkalinity 160-1,310 ppm CaCO3, conductivity 460-7,600 microns hos/cm, chlorides 22-1,560 ppm) and significantly altered immature survival, development time, and female body size (wing length), consistent changes in infection, dissemination, or transmission rates were not observed. Susceptibility (ID50) to WEE virus in field strains decreased as a linear function of developmental time, with populations from a dry alkali lake bed (Goose Lake) least susceptible. Three subsequent laboratory experiments that tested the effects of ...Continue Reading

Citations

Dec 21, 2004·Journal of Medical Entomology·Louise A Kelly-HopeBrian H Kay
Apr 6, 2004·Journal of Medical Entomology·Louise A Kelly-HopeBrian H Kay
Jul 27, 2002·Annual Review of Microbiology·Margo A Brinton
Dec 9, 2008·Journal of Medical Entomology·William K ReisenVincent M Martinez
Feb 8, 2011·PloS One·Rebecca C Christofferson, Christopher N Mores
Jul 16, 2015·The American Journal of Tropical Medicine and Hygiene·M Camille HarrisDana M Hawley
Mar 30, 2018·PLoS Neglected Tropical Diseases·James Weger-LucarelliErik A Karlsson
Aug 27, 2011·Vector Borne and Zoonotic Diseases·Brittany L DodsonJason L Rasgon

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