alexa Effect of Antibiotic Combinations on the Sensitivity of Carbapenem Resistant Acinetobacter baumannii Strains
ISSN: 1948-5948

Journal of Microbial & Biochemical Technology
Open Access

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Research Article

Effect of Antibiotic Combinations on the Sensitivity of Carbapenem Resistant Acinetobacter baumannii Strains

Elhabibi T1* and Ramzy S2

1Department of Microbiology and Immunology, Faculty of Pharmacy, Egyptian Russian University, Egypt

2Department of Microbiology and Immunology, Faculty of Pharmacy, Al-Azhar University, Egypt

Corresponding Author:
Elhabibi T
Department of Microbiology and Immunology
Faculty of Pharmacy, Egyptian Russian University, Egypt
Tel: 201004622554/201021411433
E-mail: [email protected]

Received date: May 28, 2016; Accepted date: June 08, 2017; Published date: June 15, 2017

Citation: Elhabibi T, Ramzy S (2017) Effect of Antibiotic Combinations on the Sensitivity of Carbapenem Resistant Acinetobacter baumannii Strains. J Microb Biochem Technol 9:132-137. doi:10.4172/1948-5948.1000356

Copyright: © 2017 Elhabibi T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

Acinetobacter baumannii is one of the predominant pathogens involved in hospital acquired infections worldwide. Despite intensive surveillance and preventive measures, these infections are major cause of high mortality rates. In this study a total of 375 A. baumannii isolates were isolated from a variety of clinical collected from 5 different hospitals in Great Cairo. These isolates were identified as A. baumannii biochemically, by API20E system and genetically by detection of 16S rRNA gene. All isolates showed positive results and confirmed for the presence of the suspected gene by PCR. The antibiotic susceptibility patterns for the isolated A. baumannii were also evaluated. The detection of the presence of OXA-type (OXA 23, 24, 51 and 58) carbapenemases-encoding genes which are responsible for carbapenem resistance was also performed. I observed the presence of OXA 23 gene in 84% of the isolates. While 35.2% were positive to OXA 24 gene and 87.2% were positive to OXA 51 gene. No isolates showed positive results for the presence of OXA 51 gene. They were also evaluated for the effectiveness of drug combination of carbapenems and colistin against 30 isolates. Regarding imipenem and colistin combination, 13.3% of the strains showed synergy, while 86.7% showed additive results. For the combination of meropenem and colistin, 66.7% of the strains showed synergy, while 33.3% showed additive results. The antibacterial effect of both combinations on A. baumannii showed commonly synergistic or additive results. To a significant extent meropenem and colistin showed a superior synergy compared to imipenem and colistin.

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