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- Title
Carbapenem resistance in Acinetobacter baumannii clinical isolates from northwest Iran: high prevalence of OXA genes in sync.
- Authors
Vahhabi, Abolfazl; Hasani, Alka; Rezaee, Mohammad Ahangarzadeh; Baradaran, Behzad; Hasani, Akbar; Kafil, Hossein Samadi; Soltani, Elgar
- Abstract
Background and Objectives: Carbapenem treatment for Acinetobacter baumannii infections presently faces threats owing to the production of several types of carbapenemase enzymes, prevalence of which varies among different countries. We explored the current trend of antibiotic resistance in A. baumannii clinical isolates from North West Iran, sought the mechanism of carbapenem resistance and addressed the sequence type groups in carbapenem resistant A. baumannii (CRAB). Materials and Methods: A. baumannii (n=112) isolates were recovered from various clinical specimens of patients admitted in internal, surgery, burn, infectious diseases and various ICUs wards. Genetically confirmed A. baumannii isolates were screened for carbapenem resistance by the Kirby-Bauer and E-test and the presence of blaMBL, blaOXA-like, ISAba1 genes by PCR. Sequence groups were identified by multiplex PCR. Results: Multidrug-resistance (MDR) was a characteristic feature of all A. baumannii isolates. Frequency of oxacillinase genes in combination including blaOXA-51-like/blaOXA-23-like , and blaOXA-51-like/blaOXA-23-like/blaOXA-24/40-like was 82.1%, 36.6% and 25.8% respectively. Blending of oxacillinase and MBL genes was evident in eight blaOXA-23-like positive and 7 blaOXA-24-like positive isolates thereby depicting synchronous etiology of carbapenem resistance. Amongst CRAB isolates, 97.3% contained ISAba1 element and 50.9% belonged to the European clone II. Conclusion: Synchronicity among blaOXA-like with blaMBL and ISAba1 gene was a hallmark of this investigation. Though origin or route of transmission was not elucidated in this study but co-existence among OXA and MBL producing genes is a therapeutic concern demanding strict surveillance strategies and control programs to halt the dissemination of these isolates in the hospital setting.
- Subjects
IRAN; ACINETOBACTER baumannii; ACINETOBACTER infections; GENES; CARBAPENEMASE; DRUG resistance in bacteria
- Publication
Iranian Journal of Microbiology, 2021, Vol 13, Issue 3, p282
- ISSN
2008-3289
- Publication type
Article