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Jundishapur Journal of Microbiology

Ahvaz Jundishapur University of Medical Sciences

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https://doi.org/10.5812/jjm.4710

Emergence of Tigecycline Resistant Acinetobacter baumannii From an Intensive Care Unit (ICU) in Tehran

Author(s):
Afsaneh KarmostajAfsaneh Karmostaj1, Shahin Najar PeerayehShahin Najar Peerayeh1,*, Ali Hatef SalmanianAli Hatef Salmanian2
1Department of Bacteriology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, IR Iran
2National Institute of Genetic Engineering and Biotechnology, Tehran, IR Iran
Jundishapur Journal of Microbiology:Vol. 6, issue 3; 215-19
Published online:Apr 30, 2013
Article type:Research Article
Received:May 23, 2012
Accepted:Aug 06, 2012
How to Cite:Karmostaj A, Najar Peerayeh S, Hatef Salmanian A. Emergence of Tigecycline Resistant Acinetobacter baumannii From an Intensive Care Unit (ICU) in Tehran. Jundishapur J Microbiol. 2013;6(3):. doi: https://doi.org/10.5812/jjm.4710

Abstract

Background:

Acinetobacter species, specially, Acinetobacter baumannii, is known, as an important opportunistic pathogen, with arnvariety of infections such as pneumonia, bacteraemia, meningitis, urinary tract, skin and soft tissue infections, associated with highrnmortality. High prevalence of multidrug resistance in A. baumannii, limits our therapeutic choices in the treatment of infectionsrncaused by this bacterium.

Objectives:

The current study aimed to determine in vitro activity of tigecycline and colistin against clinical isolates of MDR A. baumannii, from patients admitted in ICUs Tehran hospitals.

Material and Methods:

This study was conducted from March 2009 to November 2010, on a total of 91 Acinetobacter species isolatedrnfrom clinical specimens in ICUs. All isolates were subjected to PCR to detect blaOXA-51-like gene that is unique to A. baumannii. Thernantimicrobial susceptibility for 13 different antibiotics was tested.

Results:

A. baumannii (blaOXA-51-like gene) was detected in 84 (92.30%) isolates.Resistance rates in A. baumannii, were found to bernfor Imipenem 50 (59.52%), Gentamicin 65 (77.38%), Ciprofloxacin 81 (96.42%), Amikacin 44 (52.38%), Cefotaxime 81 (96.42%), Cefepimern69 (82.14%), Ceftazidim 81 (96.42%), Meropenem 74 (88.09%), Trimethoprim - sulfamethoxazole 78 (92.85%), Aztreonam 82 (97.61%),rnColistin and Polymyxin-B 0%. No interpretive criteria have been approved for tigecycline against Acinetobacter spp. so; the results wererninterpreted by the criteria recommended by Jones, and US FDA for Enterobacteriaceae. Resistance rates for tigecycline were 3 (3.57%)rn(Jones criteria) and 19 (22.61%) (FDA criteria).

Conclusions:

It is clear that new antimicrobials are needed to treat MDR A. baumannii. Polymyxins and tigecycline are among the fewrnantibiotics available to treat infections with these bacteria but little was known about the antimicrobial activity of these agents. ThernPresent study provided valuable information about the effects of the above mentioned drugs that can be used for health policy. Itrnshould be noted that there is a need for regular surveillance of bacterial resistance to these antimicrobial agents.

Keywords
Acinetobacter baumannii
Colistin
Tigecycline
FDA criteria

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