Principal opportunist Mycobacterium species causing human disease
| Disease site | Opportunist species |
| Pulmonary | M avium complex |
| M kansasii | |
| M xenopi | |
| M malmoense | |
| M abscessus | |
| M fortuitum | |
| M celatum | |
| M asiaticum | |
| M sulgai | |
| Lymph node | M avium complex |
| M malmoense | |
| M scrofulaceum | |
| M genavense | |
| Cutaneous/musculoskeletal | M marinum |
| M ulcerans | |
| M fortuitum | |
| M abscessus | |
| M chelonae | |
| M avium complex | |
| M kansasii | |
| M malmoense | |
| M terrae | |
| Disseminated | M avium complex |
| M kansasii | |
| M genavense | |
| M chelonae | |
| M abscessus | |
| M haemophilum | |
| M scrofulaceum | |
| M celatum | |
| M simiae | |
| M malmoense |