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Cellular response. IFN-γ ELISpot analysis of the PBMC response is expressed as SFC/106 cells to the pH1N1 A/swine/England/1353/2009 antigen (a) for the duration of the study or specifically for (b) 72dpv (3dpi) and (c) 78dpv (9dpi). Horizontal lines indicate significant differences (**p = 0.049) between groups and vertical bars represent ±SEM.
