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Using the indirect fluorescent antibody method, the production and persistence of specific antibody was demonstrated in three patients inoculated with blood parasites of Plasmodium malariae. In one case a relatively high antibody level was maintained in association with persistent asymptomatic parasitemia, while in one of the others, termination of the infection resulted in a delayed, slow decline in antibody titer to a persistent lower level. Higher antibody titer appeared to be associated with the primary infection characterized by reduced parasitemia and febrile attack.
* Present address: Laboratory of Parasite Chemotherapy, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda 14, Maryland.
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