Development and Persistence of Antibody in Persons Infected with Babesia Microti

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  • Vector Biology and Control Division, Bureau of Tropical Diseases, and Parasitology Division, Bureau of Laboratories, Center for Disease Control, Public Health Service, U.S. Department of Health and Human Services, Atlanta, Georgia 30333

An indirect immunofluorescent test was used to determine antibody titers to Babesia microti in serum samples collected from 16 patients between 1 week and 1 year after the onset of illness. Titers rose to ≥ 1:1,024 during the first few weeks of illness and then fell gradually to 1:16 to 1:256 over the next 5–6 months.