Competitive effect of commensal faecal bacteria from growing swine fed chlortetracycline-supplemented feed on β-haemolytic Escherichia coli strains with multiple antimicrobial resistance plasmids.

Competitive effect of commensal faecal bacteria from growing swine fed chlortetracycline-supplemented feed on β-haemolytic Escherichia coli strains with multiple antimicrobial resistance plasmids.