Associations between two mosquito populations and West Nile virus in Harris County, Texas, 2003-06

James A. Dennett, Adilelkhidir Bala, Taweesak Wuithiranyagool, Yvonne Randle, Christopher B. Sargent, Hilda Guzman, Marina Siirin, Hassan K. Hassan, Martin Reyna-Nava, Thomas R. Unnasch, Robert B. Tesh, Ray E. Parsons, Rudy Bueno

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18 Scopus citations

Abstract

Associations between Culex quinquefasciatus, Aedes albopictus and West Nile virus (WNV) activity, temperature, and rainfall in Harris County, Texas 2003-06 are discussed. Human cases were highly correlated to Cx. quinquefasciatus (r = 0.87) and Ae. albopictus (r = 0.78) pools, blue jays (r = 0.83), and Ae. albopictus collected (r = 0.71), but not Cx. quinquefasciatus collected (r = 0.45). Human cases were associated with temperature (r = 0.71), not rainfall (r = 0.29), whereas temperature correlated with Ae. albopictus and Cx. quinquefasciatus collections (r = 0.88 and 0.70, respectively) and Cx. quinquefasciatus pools (r = 0.75), but not Ae. albopictus pools (r = 0.55). Both species (collections and pools) and blue jays were weakly correlated (r ≤ 0.41) with rainfall, but blue jays were better correlated with Cx. quinquefasciatus pools (r = 0.87), compared with Ae. albopictus pools (r = 0.67), Ae. albopictus collections (r = 0.69), and Cx. quinquefasciatus collections (r = 0.46). Peak minimum infection rate for Cx. quinquefasciatus (4.55), and Ae. albopictus (4.41) was in August with highest human cases (17.87), blue jays (55.58), and temperature (29.01°C). Between both species, blood meal analysis indicated 68.18% of Cx. quinquefasciatus mammalian hosts were dog, while 22.72% were human, whereas Ae. albopictus had higher human (44.44%) but fewer dog hosts (22.22%). Ten bird species were identified as hosts for Cx. quinquefasciatus, with northern cardinal and blue jay representing 26.66% and 20.00%, respectively. No bird feeding activity was observed in Ae. albopictus. The earliest and latest human blood meal occurred in May (Ae. albopictus) and November (Cx. quinquefasciatus); 66.66% of human host identifications between both species occurred in October-November, after the seasonal human case peak. Based upon our data, WNV activity in both mosquito species warrants further investigation of their individual roles in WNV ecology within this region.

Original languageEnglish (US)
Pages (from-to)264-275
Number of pages12
JournalJournal of the American Mosquito Control Association
Volume23
Issue number3
DOIs
StatePublished - Sep 1 2007

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Keywords

  • Aedes albopictus
  • Blood meal analysis
  • Blue jay
  • Culex quinquefasciatus
  • Cyanocitta cristata
  • Gravid trap
  • Minimum infection rate
  • West Nile virus

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Public Health, Environmental and Occupational Health
  • Insect Science

Cite this

Dennett, J. A., Bala, A., Wuithiranyagool, T., Randle, Y., Sargent, C. B., Guzman, H., Siirin, M., Hassan, H. K., Reyna-Nava, M., Unnasch, T. R., Tesh, R. B., Parsons, R. E., & Bueno, R. (2007). Associations between two mosquito populations and West Nile virus in Harris County, Texas, 2003-06. Journal of the American Mosquito Control Association, 23(3), 264-275. https://doi.org/10.2987/8756-971X(2007)23[264:ABTMPA]2.0.CO;2