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a-b. ElISPOT Results: Mean spot forming units with confidence intervals. Time points represent the number of days after the first vaccination for all three groups (4.a.) and after last vaccination for all three groups, i.e. after the single vaccination in Group:0, and after the second vaccination for the other two groups (Group:0+7 and Group:0+28) (4.b.). Vaccinia-Western Reserve was used as the assay antigen. Placebo recipient data is not shown.
