Detection of NDM-1 producing Klebsiella pneumoniae ST15 and ST147 in Iran during 2019-2020

Rad, Zohreh Riahi and Rad, Zahra Riahi and Goudarzi, Hossein and Goudarzi, Mehdi and Alizade, Hesam and Mazraeh, Fariba Naeimi and Sharahi, Javad Yasbolaghi and Ardebili, Abdollah and Hashemi, Ali (2021) Detection of NDM-1 producing Klebsiella pneumoniae ST15 and ST147 in Iran during 2019-2020. ACTA MICROBIOLOGICA ET IMMUNOLOGICA HUNGARICA, 68 (3). pp. 177-182. ISSN 1217-8950

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Abstract

Carbapenems are employed to treat infections caused by Grain-negative bacteria including Klebsiella pneumoniae. This research is aimed to perform phenotypic detection of 8-lactamases and molecular characterization of NDM-1 positive K pneumoniae isolates. Another objective is to investigate NDM-1 producing K. pneumoniae among children in Iran. From 2019 to 2020, altogether 60 K. pneumoniae isolates were acquired from various patients in certain Iranian hospitals. Antimicrobial susceptibility testing was performed by disk diffusion and broth microdilution methods. In addition, mCIM and eCIM were used to confirm the production of carbapenemases and metallo-beta-lactamases (MBLs), respectively. Detection of resistance genes namely, bla(ND)(M-1), bla(IMP), bla(VIM), bla(KPC) bla(OXA-48-like), bla(CTX-M), bla(SHV), bla(TEM), and mcr-1 was performed by PCR and confirmed by DNA sequencing. Multilocus sequence typing (MLST) was employed to determine the molecular typing of the strains. According to the findings, the highest rate of carbapenem resistance was detected against doripenem 83.3% (50). Moreover, 31.7% (19) were resistant to colistin. Further to the above, altogether 80% (48) were carbapenemase-producing isolates and among them 46.7% (28) of the isolates were MBL and 33.3% (20) isolates were serine beta-lactamase producer. According to the PCR results, 14 isolates produced bla(ND)(M-)1. Remarkably, four bla(NDM-1). positive isolates were detected in children. In addition, these isolates were clonally related as determined by MLST (ST147, ST15). Altogether ten bla(NDM-1) positive isolates were ST147 and four bla(NDM-1) positive isolates were ST15. Based on the results, the emergence of NDM-producing K pneumoniae among children is worrying and hence, it is necessary to develop a comprehensive program to control antibiotic resistance in the country.

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