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DTH response induced by PPD-A, PPD-B, C1, C2, ESAT-6/CFP-10, and PBS in guinea pigs previously sensitized with M. avium (a) or M. bovis (b). Responses were measured at 24 hs. Statistical differences between responses were found by using Kruskall Wallis test. (**P < 0.01; *P < 0.05).
