Assessment of antibiotic resistance pattern in Acinetobacter bumannii carrying bla oxA type genes isolated from hospitalized patients
Novelty in Biomedicine,
Vol. 1 No. 2 (2013),
16 November 2013
,
Page 54-61
https://doi.org/10.22037/nbm.v1i2.5093
Abstract
Abstract
Please cite this article as: Goudarzi H, Douraghi M, Ghalavand Z, Goudarzi M. Assessment of antibiotic resistance pattern in Acinetobacter baumannii carrying bla oxA type genes isolated from hospitalized patients. Novel Biomed 2013;1(2):54-61.
Introduction: Acinetobacter baumannii is a Gram-negative coccobacillus and one of the most opportunistic pathogens responsible for serious infections in hospitalized patients.
Methods: During a 12 month study, 221 clinical isolates and 22 environmental Acinetobacter baumannii isolates were collected. In vitro susceptibility of Acinetobacter baumannii isolates to 13 antimicrobial agents amikacin; cefepime; ceftazidime; ciprofloxacin; meropenem; piperacillin/tazobactam; sulfamethoxazole/ trimethoprim; imipenem; tigecycline; colistin; gentamycin; ceftriaxone; levofloxacin was performed by the disk diffusion method and Minimum Inhibitory Concentration(MICs) of imipenem; levofloxacin and cefepime.was done by the E-test according to Clinical and Laboratory Standards Institute (CLSI) criteria. blaOXA-23, blaOXA-24, blaOXA-58, blaOXA-51genes were detected by polymerase chain reaction and sequencing.
Results: The result of antimicrobial susceptibility test of clinical isolates by the disk diffusion method revealed that that all strains of Acinetobacter baumannii were resistant to piperacillin/tazobactam. The rates of resistance to the majority of antibiotics tested varied between 69% and 100 %, with the exception of tigecycline and colistin. Of 221 isolates tested 99(44.8%) were XDR. All strains carry a blaOXA-51-like gene. blaOXA-23gene was the most prevalence among blaOXA-types.
Conclusion: colistin and tigecycline can be effective drugs for treatment of Acinetobacter baumannii infections. Continuous Surveillance for Acinetobacter baumannii multidrug-resistant strains is necessary to prevent the further spread of resistant isolates.
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