Clarithromycin susceptibility days 3–5 | Clarithromycin susceptibility day 14 | Genetic implication | M. abscessus subspecies | Macrolide susceptibility phenotype |
Susceptible | Susceptible | Dysfunctional erm(41) gene | M. a. massiliense | Macrolide susceptible |
Susceptible | Resistant | Functional erm(41) gene |
M. a. abscessus
M. a. bolletii | Inducible macrolide resistance |
Resistant | Resistant | 23S ribosomal RNA point mutation | Any | High-level constitutive macrolide resistance |