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Comparative susceptibility of mosquito populations in North Queensland, Australia to oral infection with dengue virus

By Yixin H. Ye, Tat Siong Ng, Francesca D. Frentiu, Thomas Walker, Andrew F. van den Hurk, Scott L. O'Neill, Nigel W. Beebe and Elizabeth A. McGraw

Abstract

Dengue is the most prevalent arthropod-borne virus, with at least 40% of the world’s population at risk of infection each year. In Australia, dengue is not endemic, but viremic travelers trigger outbreaks involving hundreds of cases. We compared the susceptibility of Aedes aegypti mosquitoes from two geographically isolated populations with two strains of dengue virus serotype 2. We found, interestingly, that mosquitoes from a city with no history of dengue were more susceptible to virus than mosquitoes from an outbreak-prone region, particularly with respect to one dengue strain. These findings suggest recent evolution of population-based differences in vector competence or different historical origins. Future genomic comparisons of these populations could reveal the genetic basis of vector competence and the relative role of selection and stochastic processes in shaping their differences. Lastly, we show the novel finding of a correlation between midgut dengue titer and titer in tissues colonized after dissemination

Topics: 060207 Population Ecology, 060502 Infectious Agents, 060506 Virology
Publisher: American Society of Tropical Medicine and Hygiene
Year: 2014
DOI identifier: 10.4269/ajtmh.13-0186
OAI identifier: oai:eprints.qut.edu.au:68390
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