TABLE 1.

Characterization of 29 conjugable fosA3-positive E. coli isolates

Strains	Context of fosA3a	Resistance profileb	Resistance genes
EC27	V	FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-9, blaTEM, rmtB, floR
EC28	V	FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-9, blaTEM, floR
EC29	I	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC30	I	CAZ, FFC, CHL, TET, TGC, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC31	II	CAZ, FFC, CHL, TET, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC32	II	CAZ, FFC, CHL, TET, CIP, AMK, COL, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC33	IV	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC34	V	FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-9, blaTEM, floR
EC35	VI	FFC, CHL, TET, CIP, FOS	fosA3, blaTEM, floR
EC36	VI	CAZ, FFC, CHL, TET, CIP, AMK, FOS	fosA3, blaCTX-M-1, blaTEM, rmtB, floR
EC37	I	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC38	VI	FFC, TET, FOS	fosA3, floR
EC39	II	FFC, CHL, TET, CIP, TGC, FOS	fosA3, blaTEM, floR
EC40	IV	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-9, floR
EC41	VI	CAZ, FFC, CHL, TET, CIP, TGC, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC42	V	FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-9, blaTEM, floR
EC43	IV	CAZ, FFC, CHL, TET, CIP, COL, FOS	fosA3, blaCTX-M-1, blaCTX-M-9, blaTEM, floR
EC44	II	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC45	I	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-1, floR
EC46	VI	CAZ, FFC, CHL, TET, CIP, TGC, FOS	fosA3, blaCTX-M-9, rmtB, floR
EC47	II	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC48	II	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-9, blaTEM, rmtB, floR
EC49	VI	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-1, blaTEM, floR
EC50	V	FFC, CHL, TET, CIP, FOS	fosA3, blaCTX-M-9, blaTEM, floR
EC51	VI	FFC, CHL, TET, CIP, TGC FOS	fosA3, blaCTX-M-9, blaTEM, floR
EC52	I	FFC, CHL, TET, AMK, TGC, FOS	fosA3, blaCTX-M-1, blaTEM, rmtB, floR
Kpg84	/	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, fosA7.5, blaCTX-M-1, floR, blaTEM
fEc.1	III	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, fosA7.5, blaCTX-M-1, floR, blaTEM
ECg85	/	CAZ, FFC, CHL, TET, CIP, FOS	fosA3, fosA7.5, blaCTX-M-1, floR, blaTEM

^a/, the genetic environment of fosA3 was not detected.

^bCAZ, ceftazidime; FFC, florfenicol; CHL, chloramphenicol; TET, tetracycline; CIP, ciprofloxacin; AMK, amikacin; COL, colistin; TGC, tigecycline; MEM, meropenem; FOS, fosfomycin.