Vector Competence of California Mosquitoes for California Encephalitis and California Encephalitis-Like Viruses

Laura D. Kramer Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Department of Entomology, University of California, Berkeley, California

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William C. Reeves Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Department of Entomology, University of California, Berkeley, California

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James L. Hardy Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Department of Entomology, University of California, Berkeley, California

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Sally B. Presser Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Department of Entomology, University of California, Berkeley, California

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Bruce F. Eldridge Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Department of Entomology, University of California, Berkeley, California

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Michael D. Bowen Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Department of Entomology, University of California, Berkeley, California

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DOI:
https://doi.org/10.4269/ajtmh.1992.47.562
Volume/Issue:
Volume 47: Issue 5
Page(s):
562–573
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Mosquitoes collected from coastal, inland valley, and alpine locations in California were evaluated for their experimental vector competence for two viruses in the California serogroup (Bunyaviridae: Bunyavirus). Aedes squamiger, a coastal salt marsh mosquito, was an efficient vector of a California encephalitis (CE)-like virus isolated from its habitat (89% of the pledget-fed females became infected and 61% transmitted virus). Aedes dorsalis, a coastal mosquito, and Ae. melanimon, an inland valley mosquito, were competent vectors of prototype CE virus (98% and 100% of the pledget-fed females became infected and 56% and 30%, respectively, transmitted virus). Aedes squamiger and Ae. dorsalis transmitted both viruses vertically to one or more of 20 of their progeny. Culiseta inornata was susceptible to infection with both viruses, but 5% or less transmitted virus perorally. Alpine mosquitoes, Ae. cataphylla, Ae. increpitus, and Ae. tahoensis, became infected with both CE and CE-like viruses, but 3% or less transmitted virus. All species of mosquitoes were more efficient vectors of both viruses following intrathoracic inoculation than following pledget feeding, suggesting the presence of mesenteronal barriers.

Author Notes

Copyright:
Copyright © 1992 by The American Society of Tropical Medicine and Hygiene 1992
Published Online:
Nov 1992
Cover The American Journal of Tropical Medicine and Hygiene
The American Journal of Tropical Medicine and Hygiene
Print ISSN:
0002-9637
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