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Effects of Temperature on the Transmission of West Nile Virus by Culex tarsalis (Diptera: Culicidae)
Abstract
Culex tarsalis Coquillett females were infected with the NY99 strain of West Nile virus (family Flaviviridae, genus Flavivirus, WNV) and then incubated under constant temperatures of 10-30 degrees C. At selected time intervals, transmission was attempted using an in vitro capillary tube assay. The median time from imbibing an infectious bloodmeal until infected females transmitted WNV (median extrinsic incubation period, EIP50) was estimated by probit analysis. By regressing the EIP rate (inverse of EIP50) as a function of temperature from 14 to 30 degrees C, the EIP was estimated to require 109 degree-days (DD) and the point of zero virus development (x-intercept) was estimated to be 14.3 degrees C. The resulting degree-day model showed that the NY99 WNV strain responded to temperature differently than a lineage II strain of WNV from South Africa and approximated our previous estimates for St. Louis encephalitis virus (family Flaviviridae, genus Flavivirus, SLEV). The invading NY99 WNV strain therefore required warm temperatures for efficient transmission. The time for completion of the EIP was estimated monthly from temperatures recorded at Coachella Valley, Los Angeles, and Kern County, California, during the 2004 epidemic year and related to the duration of the Cx. tarsalis gonotrophic cycle and measures of WNV activity. Enzootic WNV activity commenced after temperatures increased, the duration of the EIP decreased, and virus potentially was transmitted in two or less gon…
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“Intense heat also shortens breeding cycles and decreases extrinsic incubation periods in mosquitoes (Reisen et al. 2006).”
From Avian host community structure and prevalence of West Nile virus in Chicago, Illinois (2009) · cites this paper as Reisen et al. 2006
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Metadata
- Authors
- Reisen, W. K., Fang, Y., & Martinez, V. M.
- Affiliations
- University of California, Davis (US)
- Venue
- Journal of Medical Entomology
- Publisher
- Oxford University Press (OUP)
- Published
- 2006-03-01
- Volume
- 43
- Issue
- 2
- Pages
- 309-317
- ISSN
- 0022-2585 (ISSN-L)
- OpenAlex
- W2174439173
- Cited by
- 419
- References
- 37
- Citations by year
- 2026: 6 · 2025: 11 · 2024: 11 · 2023: 20 · 2022: 15 · 2021: 22 · 2020: 24 · 2019: 30 · 2018: 22 · 2017: 19 · 2016: 22 · 2015: 24 · 2014: 21 · 2013: 39 · 2012: 26
- FWCI
- 22.64
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Medical Entomology (publishedVersion)
- PubMed (publishedVersion)
- BioOne Complete (BioOne) (submittedVersion)
- Funders
- National Institutes of Health (5r01ai055607-09)
- Goddard Space Flight Center
- National Institute of Allergy and Infectious Diseases (1-R01-AI55607)
- Topics
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Mosquito-borne diseases and control
- Health Sciences › Medicine › Infectious Diseases › Viral Infections and Vectors
- Life Sciences › Immunology and Microbiology › Virology › Vector-Borne Animal Diseases
- Keywords
- West Nile virus, Culex tarsalis, temperature effects on transmission, extrinsic incubation period, degree-day model, St. Louis encephalitis virus, vector competence, Kern County, virus dispersal
- MeSH terms
- Animals, California, Culex, Encephalitis Virus, St. Louis, Encephalitis Virus, Western Equine, Female, Insect Vectors, Regression Analysis, Saliva, Seasons, Temperature, Time Factors, West Nile Fever, West Nile virus
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- CoChat. (2026). Citation check: Effects of Temperature on the Transmission of West Nile Virus by Culex tarsalis (Diptera: Culicidae). https://app.cochat.ai/papers/10.1603/0022-2585(2006)043%5B0309:eotott%5D2.0.co;2
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- Reisen, W. K., Fang, Y., & Martinez, V. M. (2006). Effects of Temperature on the Transmission of West Nile Virus by Culex tarsalis (Diptera: Culicidae). Journal of Medical Entomology. https://doi.org/10.1603/0022-2585(2006)043%5B0309%3Aeotott%5D2.0.co%3B2