Babesia microti, the primary agent of human babesiosis in the United States.
The B. microti life cycle involves two hosts, which includes a rodent, primarily the white-footed mouse, Peromyscus leucopus, and a tick in the genus, Ixodes, the same tick species that vectors Lyme disease. Cases of babesiosis caused by B. microti occur in southern New England and the northern Midwest. Early clinical manifestations are intermittent fevers accompanied by fatigue and malaise, headache, chills, and myalgias. Nausea, vomiting, reduced appetite, and depression can also occur. Coinfection with Lyme disease or anaplasmosis may complicate the clinical presentation and predispose the patient to more severe disease.
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