West Nile virus is most often spread by the bite of an infected mosquito. Mosquitoes become infected when they feed on infected birds. Birds of several species, chiefly migrants, appear to be the major introductory or amplifying hosts and contribute to movement of the virus. This ambulates West Nile virus throughout both temperate and tropical regions of the Western Hemisphere.
Also, Mosquitoes thrive in rainy conditions, and this summer provided a huge breeding ground for them. This summer set record high rainfall and mosquito levels. The Culex genus of mosquitoes, the primary carrier of West Nile and other diseases, breed in pools of standing water.
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