Dissemination of CTX-M-15 β-Lactamase Genes Carried on Inc FI and FII Plasmids among Clinical Isolates of Escherichia coli in a University Hospital in Istanbul, Turkey

The CTX-M-1 group was found in 86.8% of the Escherichia coli isolates from Istanbul. A subset study revealed all isolates carrying blaCTX-M-15 genes flanked by the insertion element ISEcp1. Plasmid typing of transconjugates carrying blaCTX-M-15 showed that most isolates belonged to the Inc/rep FII group but that one isolate also belonged to the FI group.