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Guinea pig DTH responses to specific antigens. Individual DTH responses and mean responses (—) in M. tuberculosis-infected (○), BCG-vaccinated (□), M. avium-sensitized (◊), and naive (▿) guinea pigs to PPD, ESAT-6, or CFP10 are shown. DTH responses were read after 24 h, and the dotted line indicates the limit for positive responses (5 mm).
