Babesiosis is an infectious disease caused by protozoa of the genus <i>Babesia</i> and characterized by a febrile illness and hemolytic anemia but with manifestations ranging from an asymptomatic infection to a fulminating illness that can result in death.

Sudden loss of renal function, as manifested by decreased urine production, and a rise in serum creatinine or blood urea nitrogen concentration (azotemia).