IFNG and tuberculosis: The objectives of the present work were: (1) to investigate the possible interference of vaccination before and after M. caprae infection on TB diagnostic tests (single and comparative skin tests and IFN-γ assay); (2) to assess the usefulness of DIVA-peptide candidates E/C and Rv3615c; and (3) to evaluate immunological and post-mortem indicators of the effects of PTB vaccination on M. caprae infection.