Infectious Mosquitoes Are Turning Up in New Regions

A mounting number of citations on a popular disease-tracking website suggests that mosquitoes may be moving into new ecological niches with greater frequency.

The website, ProMED mail, has carried more than a dozen such reports since June, all involving mosquito species known to transmit human diseases.

Most reports have concerned the United States, where, for example, Aedes aegypti — the yellow fever mosquito, which also spreads Zika, dengue and chikungunya — has been turning up in counties in California and Nevada where it had never, or only rarely, been seen

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