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The peripheral blood lymphocyte responses to Mycobacterium bovis (PPD) antigens were measured in animals vaccinated with either bacillus Calmette–Guérin (BCG) or recombinant BCG (rBCG). Blood samples were taken at 2, 4, 8, 12 and 14 weeks. The lymphocytes were assayed for antigen-specific lymphocyte transformation. The data represents the mean±SE of the group (n = 6).
