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Frequencies of transfer of antibiotic resistance genes from STEC 7-63 to MG1655 in bovine feces with pH values of 5.5, 6.0, and 6.5 at 28°C. (a) Transconjugants selected on SMAC supplemented with oxytetracycline. (b) Transconjugants selected on SMAC supplemented with tetracycline.
