An elderly woman contracted transfusion-induced babesiosis, accompanied by disseminated intravascular coagulopathy. Her parasitemia cleared after treatment with several antibiotic and antimalarial drugs, but she died of cardiopulmonary failure. One of the transfusion donors had a high indirect fluorescent antibody titer against Babesia microti but was asymptomatic; his parasitemia was detected only by hamster inoculation, illustrating the difficulty in detecting the carrier state.
Marcus LC, Valigorsky JM, Fanning WL, Joseph T, Glick B. A Case Report of Transfusion-Induced Babesiosis. JAMA. 1982;248(4):465-467. doi:10.1001/jama.1982.03330040053031