Dissemination of the fosfomycin resistance gene fosA3 with CTX-M β-lactamase genes and rmtB carried on IncFII plasmids among Escherichia coli isolates from pets in China

Jianxia Hou, Xianhui Huang, Yuting Deng, Liangying He, Tong Yang, Zhenling Zeng, Zhangliu Chen, Jian-Hua Liu
Antimicrobial Agents and Chemotherapy 2012, 56 (4): 2135-8
The presence and characterization of plasmid-mediated fosfomycin resistance determinants among Escherichia coli isolates collected from pets in China between 2006 and 2010 were investigated. Twenty-nine isolates (9.0%) were positive for fosA3, and all of them were CTX-M producers. The fosA3 genes were flanked by IS26 and were localized on F2:A-:B- plasmids or on very similar F33:A-:B- plasmids carrying both bla(CTX-M-65) and rmtB. These findings indicate that the fosA3 gene may be coselected by antimicrobials other than fosfomycin.

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