Fig. 1

Map of the counties included in the study and seroprevalence maps of Borrelia burgdorferi, Anaplasma spp., Ehrlichia spp., and Dirofilaria immitis. For the county map, gray counties are where dogs originated from and black counties are where the shelters are located. For the seroprevalence map, the circles denote the approximate number of dogs tested in the state, and states in gray were not included in the study. The maps were created in R statistical software (R Core Team)