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IFN-γ responses to PPDB, PPDA, and 20 μg of the E6-C10 protein cocktail in herds with high and low prevalences of bovine tuberculosis (A) and in TB-free herds (B). The results are presented as medians and interquartile ranges. The statistical differences between responses were determined by using the Kruskal-Wallis test (**, P < 0.01; ***, P < 0.001).
