Bazgir ZN, Ahanjan M, Goli HR, Gholami M, Ghasemian R, Hashemi-Soteh MB. Frequency of bla
IMP and bla
SPM Metallo-β-Lactamase Genes among Carbapenem-Resistant Pseudomonas aeruginosa Clinical Isolates in Sari, North of Iran.
RECENT ADVANCES IN ANTI-INFECTIVE DRUG DISCOVERY 2021;
16:148-156. [PMID:
34961433 DOI:
10.2174/2772434416666210607141520]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 04/03/2021] [Accepted: 04/07/2021] [Indexed: 12/31/2022]
Abstract
INTRODUCTION
Metallo-β-lactamases (MBLs) play a major role in the resistance of Pseudomonas aeruginosa to carbapenems. We investigated the antibiotic susceptibility patterns and frequency of MBLs genes (blaIMP and blaSPM) in carbapenem-resistant P. aeruginosa clinical isolates in Sari, Iran.
MATERIALS AND METHODS
The isolates were identified using standard microbiological tests, and their antibiotic susceptibility pattern was determined by the disk agar diffusion method according CLSI criteria. Phenotypic identification of MBL-producing strains assessed by the combined disk test (CDT). Then, polymerase chain reaction (PCR) was used to detect the presence of blaIMP and blaSPM genes.
RESULTS
The highest and lowest levels of antibiotic resistance were observed against gentamicin (40%) and piperacillin-tazobactam (13%), respectively. Besides, 40 isolates (40%) had the multi-drug resistant (MDR) phenotype, while 5 (12.5%) MDR isolates were resistant to all antibiotics tested. The results of the CDT showed that among 43 carbapenem non-susceptible clinical isolates of P. aeruginosa, 33 (76.74%) isolates were MBL-producing strains. Also, the frequency of the blaIMP gene among 43 carbapenem non susceptible isolates was determined to be 6.97%, while none of these isolates carried the blaSPM gene.
CONCLUSION
Due to the high prevalence of carbapenem-resistant and MDR P. aeruginosa in this study, routine antibiotic susceptibility testing and phenotypic identification of carbapenemase production by this bacterium are necessary for the proper selection of antibiotics.
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