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Maps of counties with reported human cases, tick detected with a pathogen and overlap between human cases and ticks infected with a pathogen. Thick black lines denote climatic regions. (A) Map of human cases of Lyme disease and detection of ticks with B. burgdorferi. (B) Map of human cases of Ehrlichiosis and detections of ticks infected with E. ewingii. (C) Map of human cases of Ehrlichiosis and detections of ticks infected with pathogenic Rickettsia species.
