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Culex pipiens mosquito

Closeup of a mosquito perched on a green leaf. The mosquito is mostly golden brown in color, with darker stripes on its abdomen and dark green eyes.

In an analysis of mosquito sampling across 20 years in Connecticut, mosquito populations—such as those of Culex pipiens, a primary vector of West Nile virus—were often correlated at sites 10 kilometers apart and sometimes as far as 40 kilometers apart. But the same data showed the presence of mosquito-borne viruses rarely correlated across distances more than 5 kilometers, complicating potential approaches to managing mosquitoes and the risk of vector-borne disease. (Photo by Ary Farajollahi,

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