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Specificity for tuberculous mycobacteria of multiantigen cocktails tested at different doses. Protocols of guinea pig sensitization and skin testing with PPD and multiantigen cocktails were as described in the legend to Fig. 2. SpI was calculated as described in Table 2, footnote b. ⧫, PPD; ■, cocktail A (M. tuberculosis complex specific); ▴, cocktail B (cross-reactive); •, cocktail C (antigens in cocktails A plus B).
