beta-lactamase encoded genes blatem and blactx among acinetobacter baumannii species isolated from medical devices of intensive care units in tehran hospitals

نویسندگان

sara khalilzadegan department of microbiology, guilan science and research branch, islamic azad university, rasht, ir iran

mojtaba sade international branch, shahid beheshti university of medical sciences, tehran, ir iran; international branch, shahid beheshti university of medical sciences, tehran, ir iran. tel: +98-2165352504, fax: +98-2165352503

hussein godarzi microbiology group, shahid beheshti university of medical sciences, tehran, ir iran

gita eslami microbiology group, shahid beheshti university of medical sciences, tehran, ir iran

چکیده

conclusions it seems that besides the variety and prevalence of blatem and blactx, enormous mechanisms such as porin and leaking systems (efflux pumps) are responsible for the information of the a. baumannii resistance to disinfectants. the study on an accurate consideration of the resistance in strains and other microorganisms is advised. results in the current study, 131 a. baumannii isolates (22.3%) out of 588 were studied. the level of resistance to various antibiotics was in the range of 69.4% to 100%. the frequencies of blatem and blactx genes were 3.2% and 19.4%, respectively. mic50% and mic90% of imipenem and meropenem antibiotics were 32 ± 1 µg/ml and 64 ± 1 µg/ml, respectively (p < 0.9). however no resistance to glutaraldehyde was observed. different bands of mdr strains were observed in the pcr product by electrophoresis. background excessive consumption of antimicrobial materials in hospitals is considered as the main encoder leading to the emergence, development and acquisition of new bacterial resistance to beta-lactamase. objectives owing to the lack of proper information regarding the mechanism of the bacterial resistance to antibiotics and responsible genes in the country, the current study aimed to consider the resistance or sensitivity of the acinetobacter baumannii multi drug resistant (mdr) isolates facing 2% glutaraldehyde. the study was conducted in the selected intensive care units in tehran hospitals, iran, in 2013. materials and methods in this study conducted over a period of 10 months, a. baumannii species were isolated by bacterial culture following biochemical tests from intensive care units (icus) of some hospitals in tehran, iran (fayazbaksh, taleghani, imam khomeini, valiasr, labafinejad). the resistance and sensitivity of the isolates to antibiotics were considered according to the clinical and laboratory standard institute clsi (2012) guidelines. by multiplex pcr method, blactx and blatem genes were detected and finally, mdr strains were treated with 2% glutaraldehyde. pcr was used for each strain of mdr using specific primers.

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عنوان ژورنال:
jundishapur journal of microbiology

جلد ۹، شماره ۵، صفحات ۰-۰

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