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Comparison of immune responses in subjects with and without identified epitopes. Average immune responses to vaccinia virus (left panel = humoral response represented by ID50 values, right panel = cellular immunity denoted by IFNγ ELISPOT S.I.) for subjects with identified T cell epitopes are compared to the anti-viral immune responses of subjects for which no epitopes were found. Student's t test comparison p-values are indicated on each graph.
