Reported county-level distribution of bacterial pathogens (A) Borrelia burgdorferi s.s. and B. mayonii, (B) B. miyamotoi, and (C) Anaplasma phagocytophilum, in host-seeking Ixodes scapularis (eastern United States) or Ixodes pacificus (western United States), 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 in Fleshman et al 2022, Journal of Medical Entomology)