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Spatial variation in West Nile virus (WNV) infected mosquitos. Panels show the fraction of 51,650 reported Culex WNV-positive mosquito pools (of 1–50 mosquitoes) from each of four Culex species (A = Culex tarsalis, B = Culex restuans, C = Culex pipiens, and D = Culex quinquefasciatus) for 821 counties across the United States (US) between the years 2004 and 2009. This figure appears in color at www.ajtmh.org.
