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U.S. distribution of Lyme disease-causing bacteria in ticks

U.S. distribution of Lyme disease-causing bacteria in ticks

A new study by CDC researchers maps the distribution of Lyme disease spirochetes, Borrelia burgdorferi sensu stricto and Borrelia mayonii, in host-seeking blacklegged ticks (Ixodes scapularis, in the eastern U.S.) or western blacklegged ticks (I. pacificus, in the western U.S.), relative to the previously reported distribution of these vector species. Ticks were considered present in a county if at least one tick was recorded. Counties where ticks have been reported without records of infection may be reported as such either if ticks were not tested or if the pathogen was not detected in tested samples. (Image originally published Fleshman et al 2021, Journal of Medical Entomology)

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