Figure 1.

Characterization of extended spectrum β-lactamase (ESBL)-producing E. coli (ESBLECs) isolated from healthy Thoroughbred racehorses and their ability to transfer the ESBL gene. ^a Miho, Miho Training Center, Japan Racing Association, Ibaraki; Ritto, Ritto Training Center, Japan Racing Association, Shiga. ^b Y, Successful conjugation; N, Not successful conjugation. ^c ABPC, ampicillin; CEZ, cefazolin; CTX, cefotaxime; SM, streptomycin; TC, tetracycline; OTC, oxytetracycline; STX, trimethoprim-sulfamethoxazole. Antimicrobial susceptibility test was interpreted using CLSI criteria and JVARM report. ^d PBRT, PCR-based replicon typing.