Where blacklegged ticks are carrying disease-causing bacteria

Blacklegged ticks (Ixodes scapularis), which citizen scientists sent to Bay Area Lyme Foundation’s Free Tick Testing Program (2016-2019), were tested for the presence of disease agents that cause Lyme disease (Borrelia burgdorferi sensu lato), tick-borne relapsing fever (Borrelia miyamotoi), babesiosis (Babesia microti), and anaplasmosis (Anaplasma phagocytophilum). Check out the map to see where we found ticks carrying these pathogens. Grey counties indicate where black-legged ticks were collected but pathogens were undetected. White counties indicate areas where no blacklegged ticks were collected.


Map #1: The U.S. counties where we found ticks capable of carrying disease 

Map #3: Where western blacklegged ticks are carrying disease-causing bacteria 

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