Babesiosis Presenting as Acute Liver Failure

Babesiosis is a zoonotic, tick-borne infection caused by the protozoan Babesia. It is transmitted by the Ixodes ticks which transmit the infection to humans. Babesia microti, Babesia duncani, Babesia divergens, and Babesia venatorum are species that have been identified as being infectious to humans worldwide. The most common species causing infection to humans is B. microti which is endemic to the Northeast and Midwestern United States with most infections occurring between the months of May and October. We report a case of an elderly man with acute liver failure due to an infection with B. microti.