CAMP and infection: However, C57BL/6 mice showed a strong up-regulation of Camp, encoding for the antimicrobial peptide CRAMP, displaying direct mycobacterial killing ability, with a peak of transcription 6 h post-infection, while BALB/c showed no change in the expression of Camp. These results suggest that C57BL/6 mice exhibit higher ability to directly kill BCG than BALB/c without the necessity of a strong inflammatory response.