Open AccessAntimicrobial susceptibility patterns and MICs among non-photochromogenic rapidly growing Mycobacteroides and Mycolicibacterium species
Author(s) -
Shiomi Yoshida,
Kazunari Tsuyuguchi,
Kinuyo Chikamatsu,
Akio Ando,
Akiko Takaki,
Satoshi Mitarai,
Takehiko Kobayashi,
Yoshikazu Inoue,
Katsuhiro Suzuki
Publication year - 2019
Publication title -
journal of medical microbiology/journal of medical microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 117
eISSN - 1473-5644
pISSN - 0022-2615
DOI - 10.1099/jmm.0.001035
Subject(s) - biology , microbiology and biotechnology , amikacin , erythromycin , antimicrobial , linezolid , clarithromycin , antibiotics , bacteria , genetics , vancomycin , staphylococcus aureus
. Non-photochromogenic rapidly growing mycobacteria (NPRGM) that branch distinctly from Mycobacteroides (Myco) and Mycolicibacterium (Mycolici) are increasingly observed clinically and present a complicated treatment challenge; thus, appropriate in vitro susceptibility testing is required. Methodology. We evaluated the MICs of nine antimicrobials used in the treatment of infections of 25 NPRGM type strains. The relation of inducible macrolide resistance with functional erythromycin ribosomal methylase ( erm ) genes was also investigated. Results. The initial clarithromycin MIC reading at 3 days showed resistance in four of the Mycolici strains. In contrast, the presence of erm genes among Mycolici species differed from previous findings. Both Myco and Mycolici species were highly susceptible to amikacin and linezolid. Myco species were resistant to fluoroquinolones, while Mycolici species were susceptible. Meropenem showed low activity against Myco species, but high activity against Mycolici species. Conclusion. NPRGM clade-specific susceptibility patterns suggest an urgent need to establish distinct breakpoints for Myco and Mycolici species.