Differences in drug susceptibility pattern between Mycobacterium avium and Mycobacterium intracellulare isolated in respiratory specimens. Issue 4 (April 2018)

• Record Type: Journal Article
• Authors: Cho, Eun Hye; Huh, Hee Jae; Song, Dong Joon; Moon, Seong Mi; Lee, Seung-Heon; Shin, So Youn; Kim, Chang Ki; Ki, Chang-Seok; Koh, Won-Jung; Lee, Nam Yong
• Is Part Of: Journal of infection and chemotherapy. Volume 24:Issue 4(2018:Apr.)
• Page Start: 315
• Page End: 318
• Publication Date: 2018-04
• Subjects: Nontuberculous mycobacteria -- Mycobacterium avium -- Mycobacterium intracellulare -- Drug susceptibility test; Chemotherapy -- Periodicals; Infection -- Periodicals; Communicable diseases -- Chemotherapy -- Periodicals; 615.5805
• DOI: 10.1016/j.jiac.2017.10.022
• Languages: English
• ISSNs: 1341-321X

Abstract

Abstract: Mycobacterium avium complex (MAC) is the most common etiologic organisms of nontuberculous mycobacteria (NTM) lung disease. In this study, we aimed to retrospectively investigate the differences in drug susceptibility patterns of two major MAC species; Mycobacterium avium and Mycobacterium intracellulare . A total of 1883 major two MAC isolates (1060 M. avium and 823 M. intracellulare ) from respiratory specimens were included in this study during the period 2011─2016. The minimum inhibitory concentrations (MICs) were determined by broth microdilution method and MIC50 /MIC90 values were derived from MIC distribution. M. intracellulare had generally low susceptible rates than M. avium for almost all tested antimicrobials except ethambutol and amikacin. The susceptible rate to clarithromycin was >94% of the MAC without significant differences between the two species. The MIC50 values of ciprofloxacin, clarithromycin, linezolid, moxifloxacin, and rifampicin were higher in M. intracellulare than in M. avium, contrary to the results of ethambutol with a higher MIC50 in M. avium . In general, M. intracellulare showed a higher resistance rate and higher MIC50 values than M. avium . Differences between this study and previous reports suggest regional differences in drug susceptibility profile of MAC species.