Drug susceptibility testing of Mycobacterium simiae: An emerging pathogen in Iran
Nasiri, M. J.; Amini, S.; Nikpor, Z.; Arefzadeh, S.; Mosavi, S. M. J.; Dabiri, H.; Goudarzi, M.; Goudarzi, H.; Tabarsi, P.; Sarokhalil, D. D.; Imani Fooladi, A. A.; Feizabadi, M. M.
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IntroductionMycobacterium simiae is an emerging pathogen in Iran and little is known about drug susceptibility patterns of this pathogen. Materials and methodsTwenty five clinical isolates of M. simiae from 80 patients with confirmed NTM pulmonary disease were included in this study. For drug susceptibility testing (DST), proportional and broth microdilution methods were used according to the clinical and laboratory standards institute (CLSI) guideline. ResultsAll clinical isolates of M. simiae were resistant to isoniazid, rifampicin, ethambutol, streptomycin, amikacin, kanamycin, ciprofloxacin and clarithromycin. They also were highly resistant to ofloxacin (80%). Susceptibility to ofloxacin was only noted in the 5 isolates. ConclusionsClinical isolates of M. simiae were multidrug resistant, and had different drug susceptibility patterns than previously published studies. DST results can assist in selecting more appropriate treatment regimens. Newer drugs with proven clinical efficacy correlating with in vitro susceptibility should be substituted with first- and second line anti-TB drug testing.
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