IL15-Mϕ have a vitamin D-inducible antimicrobial activity against M. tuberculosis. IL15-Mϕ were infected with M. tuberculosis H37Ra for 16 h and subsequently cultured with either medium, 25D3 (10−8 M), or 1,25D3 (10−8 M). After 3 days, cells were lysed and colonies of mycobacteria were enumerated using the CFU assay. Data are representative (a) and average (b) of three experiments ± SEM. *, p < 0.05.