The transferability of blaOXA-23 gene in multidrug-resistant Acinetobacter baumannii isolates from Saudi Arabia and Egypt

Bruno Silvester Lopes, Mohamed H. Al-Agamy, Muhammad A. Ismail, Atef M. Shibl, Ahmed A. Al-Qahtani, Mohammed N. Al-Ahdal, Ken J. Forbes

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34 Citations (Scopus)


Carbapenem-resistant Acinetobacter spp. have been increasingly reported worldwide including Saudi Arabia and Egypt. We examined 64, non-repetitive, Acinetobacter baumannii isolates collected in 2013 and 2014 from four different medical centres (two from Saudi Arabia and two from Egypt). All the isolates were resistant to ceftazidime and ciprofloxacin. The intI1 harbouring blaGES-11 and aac-6'-1b was detected in 19% (n = 12) of the isolates. ISAba1 over-expression of blaADC gene was observed in 65% (n = 42) of isolates. Of all the isolates 19% (n = 12) had ISAba1 upstream of the blaOXA-51-like gene, 69% (n = 44) carried the blaOXA-23 gene within the Tn2006 structure, 8% (n = 5) had blaOXA-24-like gene and 9% (n = 6) harboured either blaVIM-2 or blaNDM-1 gene. Eighty nine percent (n = 57) of isolates were resistant to imipenem and had an MIC of ≥8mg/L. Pulsed-field gel electrophoresis (PFGE) typing revealed the presence of 23 different PFGE. Three PFGE types were very widespread, ST236 (CC104) (PFGE type 1, n = 15), ST208 (CC92) (PFGE type 2, n = 10), ST884 (CC unassigned) (PFGE type 3, n = 7) in and across all four medical centres. The blaOXA-23 gene was found to be present on a 60kb transferable plasmid in both PFGE type 1 and 2 but was absent in PFGE type 3. This is the first study to report on the emergence of ST236 in Saudi Arabia and Egypt, and spread of distinct carbapenem resistant A. baumannii clones belonging to ST884, ST945 and ST1096 in Saudi Arabia.

Original languageEnglish
Pages (from-to)581-588
Number of pages8
JournalInternational Journal of Medical Microbiology
Issue number6
Publication statusPublished - 1 Sept 2015

Bibliographical note

Funding Information:
We are grateful for the BMedSc project grant to BSL and MAI by the University of Aberdeen that funded this work and to Murray Robb for helpful comments. MHAA and AMS would also like to extend their appreciation to the Deanship of Scientific Research at King Saud University for funding the work through the research group project no. RGP-VPP-038.

Publisher Copyright:
© 2015 Elsevier GmbH.


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