Babesia microti is the main causative agent for human babesiosis in the United States Although there is only one confirmed human infection by B. microti in, because most cases are caused by B. divergens serological studies indicate that human B. microti infections are more common than previously recognized B. microti is widely distributed across the Northern Hemisphere), and at least two B. microti strains which may differ in terms of their association with human disease, are found in Europe