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Known as a vector for the West Nile virus, this Culex quinquefasciatus mosquito has landed on a human finger. Eliminating puddles and small containers of water can greatly reduce this mosquito's population. (Photo: CDC/Jim Gathany) Known as a vector for the West Nile virus, this Culex quinquefasciatus mosquito has landed on a human finger. Eliminating puddles and small containers of water can greatly reduce this mosquito's population.