Ticks carrying more than one pathogen are on the rise in US Northeast. Most commonly found together were the bacterium that causes Lyme disease, and a parasite that causes a malaria-like disease known as babesiosis. Co-infection with these two pathogens approached 11% by the end of the study.

Tick-borne diseases are on the rise in the northeastern US, with many ticks carrying more than one pathogen. Most commonly found together were Borrelia burgdorferi, the bacterium that causes Lyme disease, and Babesia microti, a parasite that causes a malaria-like disease known as babesiosis.