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Enterobacter species were identified by API 20E system. Antibacterial susceptibility was determined by disk diffusion method, and extended spectrum beta lactamase (ESBL) production was confirmed by combined disk method. The bla CTX-M-15 gene was identified by PCR with specific primers. The transferability of the bla CTX-M-15 was tested by conjugation with broth matting method. Results: The prevalence of Enterobacter species was E. cloacae (78.2 %), E. aerogenes (6.13 %) and E. sakazakii (8.2%). They were from different clinical sources. Maximal resistance in Enterobacter isolates was noticed against Augmentin®, trimethoprim - sulfamethoxazole and cefoxitin 75.5%, 64.5%, and 59.1%, respectively. Fourteen isolates, showed ESBL phenotype. The bla CTX-M-15 gene frequency in Enterobacter isolates was 11.8%. Three conjugative plasmids containing bla CTX-M-15 were found in one Enterobacter isolate. Conclusions: It was the first report on the bla CTX-M-15 gene emergence in clinical Enterobacter spp. in Iran. The current study demonstrated the predominant presence of the gene encoding CTX-M-15 among ESBL producing Enterobacter spp. commonly with a large plasmid, in the setting.

Emergence of blaCTX-M-15 Gene and Its Transferability in Enterobacter spp. Isolated From the Hospitals of Tehran, Iran