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Kinetics of human antibody response to early markers of infection using sera from experimental infections by Schistosoma mansoni. Immunoreactivity to S mansoni antigens were quantified on a weekly basis in 3 individuals infected with 30 male cercariae. Reactivity to proteins 44 and 65 could be detected in all volunteers as early as 5 weeks postinfection. The control antigen corresponds to the rat Cd4d3 + 4 protein tag. Data points represent mean ± standard deviation; n = 3.
