Detection of Mycobacterium lepromatosis, but not Mycobacterium leprae, by differential polymerase chain reactions for the 16S rRNA gene. Lane 1: DNA size marker; lanes 2, 3, and 4: case Mn-1 with no amplification of the 447-bp, 417-bp, or 411-bp that target both and each species respectively; lanes 5 and 8: common amplicon of 171-bp for cases Mn-1 and S63 respectively; lanes 6 and 9: amplicon of 143-bp of M. lepromatosis for cases Mn-1 and S63 respectively; lanes 7 and 10: lack of the 135-bp amplicon of M. leprae in each case.