TY - JOUR
T1 - Prevalence of nontuberculous mycobacteria and high efficacy of D-cycloserine and its synergistic effect with clarithromycin against mycobacterium fortuitum and mycobacterium abscessus
AU - Khosravi, Azar Dokht
AU - Mirsaeidi, Mehdi
AU - Farahani, Abbas
AU - Tabandeh, Mohammad Reza
AU - Mohajeri, Parviz
AU - Shoja, Saeed
AU - Khosroshahi, Seyedeh Roghayeh Hoseini Lar
N1 - Funding Information:
This work is part of PhD thesis of Abbas Farahani, which was approved in Infectious and Tropical Diseases Research Center, and was financially supported by a grant (OG-96104) from Research Affairs, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. We are greatly thankful to the staff of Regional TB Reference Laboratories for their collaboration in sample collection.
Publisher Copyright:
© 2018 Khosravi et al. This work is published and licensed by Dove Medical Press Limited. T.
PY - 2018
Y1 - 2018
N2 - Background: The prevalence of pulmonary disease caused by nontuberculous mycobacteria (NTM) is reportedly on the rise in the world. Some of the species are resistant to various antibiotics; hence, limited treatment options are available. The aims of this study were to investigate the prevalence of NTM and to determine the effect of d-cycloserine against Mycobacterium fortuitum and Mycobacterium abscessus isolated from clinical specimens to find out the synergistic effect of d-cycloserine and clarithromycin. Methods: A total of 95 nonduplicate pulmonary isolates of NTM were collected from three major Regional Tuberculosis (TB) Centers. NTM isolates were identified by conventional tests and PCR sequence analysis of the rpoB gene. PCR sequencing of erm-41 was performed for detecting the inducible resistance to macrolides. In vitro susceptibilities and activities of d-cycloserine-clarithromycin combinations were accessed using the broth microdilution method. Results: Among 714-positive acid-fast bacilli from TB-suspected cases, 95 isolates were identified as NTM (13.3%). The prevalence of identified isolates was as follows: M. fortuitum 46 (48.4%), Mycobacterium simiae 16 (16.8%), Mycobacterium kansasii 15 (15.7%), M. abscessus 7 (7.3%), Mycobacterium thermoresistibile 4 (4.2%), Mycobacterium elephantis 3 (3.2%), Mycobacterium porcinum 2 (2.1%), and Mycobacterium chimaera 2 (2.1%). In addition, rpoB sequence analysis could identify all NTM isolates. The effect of d-cycloserine was better than that of clarithromycin. The synergistic effect of d-cycloserine with clarithromycin was observed for six (100%) and five (71.5%) strains of M. fortuitum and M. abscessus, respectively. Conclusion: In the present study, we demonstrated a wide range of NTM in processed samples from different provinces of Iran. Our observations indicated that d-cycloserine was very active against M. abscessus and M. fortuitum; hence, d-cycloserine, either alone or in combination with clarithromycin, may be promising for the treatment of M. abscessus-and M. fortuitum-associated diseases.
AB - Background: The prevalence of pulmonary disease caused by nontuberculous mycobacteria (NTM) is reportedly on the rise in the world. Some of the species are resistant to various antibiotics; hence, limited treatment options are available. The aims of this study were to investigate the prevalence of NTM and to determine the effect of d-cycloserine against Mycobacterium fortuitum and Mycobacterium abscessus isolated from clinical specimens to find out the synergistic effect of d-cycloserine and clarithromycin. Methods: A total of 95 nonduplicate pulmonary isolates of NTM were collected from three major Regional Tuberculosis (TB) Centers. NTM isolates were identified by conventional tests and PCR sequence analysis of the rpoB gene. PCR sequencing of erm-41 was performed for detecting the inducible resistance to macrolides. In vitro susceptibilities and activities of d-cycloserine-clarithromycin combinations were accessed using the broth microdilution method. Results: Among 714-positive acid-fast bacilli from TB-suspected cases, 95 isolates were identified as NTM (13.3%). The prevalence of identified isolates was as follows: M. fortuitum 46 (48.4%), Mycobacterium simiae 16 (16.8%), Mycobacterium kansasii 15 (15.7%), M. abscessus 7 (7.3%), Mycobacterium thermoresistibile 4 (4.2%), Mycobacterium elephantis 3 (3.2%), Mycobacterium porcinum 2 (2.1%), and Mycobacterium chimaera 2 (2.1%). In addition, rpoB sequence analysis could identify all NTM isolates. The effect of d-cycloserine was better than that of clarithromycin. The synergistic effect of d-cycloserine with clarithromycin was observed for six (100%) and five (71.5%) strains of M. fortuitum and M. abscessus, respectively. Conclusion: In the present study, we demonstrated a wide range of NTM in processed samples from different provinces of Iran. Our observations indicated that d-cycloserine was very active against M. abscessus and M. fortuitum; hence, d-cycloserine, either alone or in combination with clarithromycin, may be promising for the treatment of M. abscessus-and M. fortuitum-associated diseases.
KW - D-cycloserine
KW - In vitro activity
KW - Mycobacterium abscessus
KW - Mycobacterium fortuitum
KW - Nontuberculous mycobacteria
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U2 - 10.2147/IDR.S187554
DO - 10.2147/IDR.S187554
M3 - Article
AN - SCOPUS:85059464370
VL - 11
SP - 2521
EP - 2532
JO - Infection and Drug Resistance
JF - Infection and Drug Resistance
SN - 1178-6973
ER -