Activities of moxifloxacin in combination with macrolides against clinical isolates of Mycobacterium abscessus and Mycobacterium massiliense.

Antimicrobial Agents and Chemotherapy
Go-Eun ChoiWon-Jung Koh

Abstract

Infections caused by Mycobacterium abscessus and Mycobacterium massiliense are on the rise among humans. Although macrolides, including clarithromycin (CLR) and azithromycin (AZM), are key antibiotics for the treatment of M. abscessus and M. massiliense infections, treatment regimens for these infections are still largely undefined. In this study, we evaluated the in vitro, ex vivo, and in vivo activities of moxifloxacin (MXF) in combination with macrolides against clinically isolated M. abscessus and M. massiliense strains. Overall, CLR, AZM, and MXF alone showed activity against both species in vitro, ex vivo, and in vivo. When MXF was combined with a macrolide against M. abscessus isolates, antagonism was observed in 65.4% (17/26) of the strains with CLR and 46.2% (12/26) of the strains with AZM in vitro as well as in 66.7% (10/15) of the strains with CLR and 40.0% (6/15) of the strains with AZM in macrophages as determined by the fractional inhibitory concentration index. In contrast, either indifferent or synergistic effects of the MXF-macrolide combinations were observed against only M. massiliense strains. Moreover, a murine infection model showed similar results. Antagonism between the MXF and macrolide combinations was...Continue Reading

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