Submitted: 28 Sep 2014
Revision: 28 Dec 2014
Accepted: 03 Feb 2015
ePublished: 23 May 2015
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Avicenna J Clin Microbiol Infect. 2015;2(2): 23954.
doi: 10.17795/ajcmi-23954
  Abstract View: 1086
  PDF Download: 705

Research Article

The Correlation Between Biofilm Formation and Drug Resistance in Nosocomial Isolates of Acinetobacter baumannii

Shiva Emami 1, Fereshteh Eftekhar 1*

1 Department of Microbiology, Faculty of Biological Sciences, Shahid Beheshti University G.C. Tehran, IR Iran
*Corresponding Author: Corresponding author: Fereshteh Eftekhar, Department of Microbiology, Faculty of Biological Sciences, Shahid Beheshti University G.C. Tehran, IR Iran. Tel: +98-2129903208, Fax: +98-2122431664, Email: f-eftekhar@sbu.ac.ir


Background: Acinetobacter baumannii has become a major cause of hospital-acquired infections due to its resistance to common antibacterial agents. Biofilm formation is a well-known pathogenic mechanism involved in A. baumannii infections.

Objectives: The aim of this study was to determine the association between biofilm formation and antibiotic resistance, production of AmpC and Extended-Spectrum β-lactamases (ESBL) in clinical isolates of A. baumannii collected from two hospitals of Tehran.

Materials and Methods: Sixty isolates of A. baumannii were employed of which, 30 were burn and 30 were non-burn isolates. Biofilm formation was measured by the microtiter plate assay. The production of AmpC was detected by the AmpC disc test with cloxacillin, and ESBL production was determined using the double disc synergy test.

Results: Biofilm production occurred in 61.7% of the isolates among which, non-burn isolates (59.5%) produced more biofilm compared to the burn strains (40.5%). Multidrug resistance was observed in both biofilm positive and negative strains. However, the non-burn isolates were significantly more resistant to meropenem and tobramycin regardless of their potential to form biofilm. Interestingly, biofilmproducing non-burn isolates were significantly more resistant to amikacin, gentamicin, tobramycin and meropenem. Production of AmpC was also significantly higher in biofilm-producing non-burn isolates. Conversely, ESBL production was significantly higher in burn isolates. There was an association between biofilm formation and AmpC but not ESBL-production among non-burn isolates.

Conclusions: The potential to form biofilm correlated with antibiotic resistance and AmpC production in non-burn burn isolates of A. baumannii. On the other hand, the burn strains produced significantly higher amounts of ESBL yet biofilm production was unrelated to antibiotic resistance or ESBL-production.

Copyright © 2015, Hamadan University of Medical Sciences. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.
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