Where western blacklegged ticks are carrying disease-causing bacteria 

Western blacklegged ticks reside on the West coast of the U.S. As part of Bay Area Lyme Foundation’s Free Tick Testing Program (2016-2019), citizen-scientists sent Western blacklegged ticks to be 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 western black-legged ticks were collected but pathogens were undetected. White counties indicate areas where no western blacklegged ticks were collected.  

 

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

Map #2: Where blacklegged ticks are carrying disease-causing bacteria 

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