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PPD-induced lymphoproliferative responses (A) and production of IFN-γ (B) by PBMCs from bacillus Calmette–Guérin (BCG)-vaccinated and nonvaccinated rhesus and cynomolgus monkeys. The results are the means (SEM) of each group. For each species, significant differences were evident for both the lymphoproliferative responses and the IFN-γ responses between nonvaccinated and bacillus Calmette–Guérin-vaccinated groups (unpaired t test, P = <0.05)
