Molecular basis of macrolide-lincosamide-streptogramin (MLS) resistance in Finegoldia magna clinical isolates.

Of 69 clinical isolates of Finegoldia magna tested, 36% presented high-level MICs of erythromycin (>256 μg/ml), harboring erm(A) (n = 20) or erm(B) (n=5). Of nine isolates exhibiting an inducible resistance phenotype to macrolides-lincosamides-streptogramins B, four (44%) were susceptible with a potential risk of treatment failure due to emergence of resistant mutants.