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Koppen–Geiger (CG) Climate Classification in study regions. Colored areas correspond to the overlap between the known WNV distribution and the CG classification in those areas. Areas highlighted in white represent places where human WNV infections have not been reported. (Data source: koeppen-geiger.vu-wien.ac.at). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
