Factors That Influence the Transmission of West Nile Virus in Florida

Journal of Medical Entomology
Jonathan F DayChelsea T Smartt

Abstract

West Nile virus (WNV) was first detected in North America in New York City during the late summer of 1999 and was first detected in Florida in 2001. Although WNV has been responsible for widespread and extensive epidemics in human populations and epizootics in domestic animals and wildlife throughout North America, comparable epidemics have never materialized in Florida. Here, we review some of the reasons why WNV has yet to cause an extensive outbreak in Florida. The primary vector of mosquito-borne encephalitis virus in Florida is Culex nigripalpus Theobald. Rainfall, drought, and temperature are the primary factors that regulate annual populations of this species. Cx. nigripalpus is a competent vector of WNV, St. Louis encephalitis virus, and eastern equine encephalitis virus in Florida, and populations of this species can support focal amplification and transmission of these arboviruses. We propose that a combination of environmental factors influencing Cx. nigripalpus oviposition, blood-feeding behavior, and vector competence have limited WNV transmission in Florida to relatively small focal outbreaks and kept the state free of a major epidemic. Florida must remain vigilant to the danger from WNV, because a change in these...Continue Reading

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Oct 7, 2015·Bulletin of Entomological Research·J A Martínez-IbarraR Bustos-Saldaña
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Oct 5, 2018·Journal of Medical Entomology·Luis Mario RomeroLuis Fernando Chaves
Mar 25, 2021·Proceedings. Biological Sciences·Meredith E KernbachClinton D Francis

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