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IL-2 (a) and IFN-γ (b) responses to PPDB following M. bovis challenge of BCG-vaccinated and unvaccinated animals (experiment 1). Data show the group mean and standard error for each group at each time point (n = 8 unvaccinated; n = 16 BCG vaccinated). Significant differences in cytokine levels between vaccinated and control groups are indicated.
