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EnvA enzyme-linked immunosorbent assays (ELISA) responses by group. Individual EnvA ELISA responses from subjects by week and vaccine group are shown. Dots show individual responses at a given time point. Red horizontal lines show the median values at a given time point for the group. Red arrows show times when vaccine or placebo was administered (the week 4 placebo injection was not given in groups 4 and 5).
