MtM antigens of interest, as determined by immunblotting, fell into two categories: those (e.g., of <10, ~12 and ~25 kDa) recognised, although with a variable intensity, by all tested sera (TB and HHC) and those (e.g., of ~16, ~36, ~45 and ~60 kDa) recognised by almost all TB sera and a subset of HHC sera. The gene discussed is MT1DP; the disease is tuberculosis.