The purpose of this paper is to investigate the multidrug resistance of swine Escherichia coli in Harbin, detecting the distribution of conjuagal plasmid traA, trbC and the I, II, III integron which is closely related to the transfer of resistance in level. In this study, 24 strains of E.coli had been sampled and isolated from invasive swines in Harbin. The resistance phenotypes to 14 kinds of antimicrobial agents were tested by Kirby- Bauer method, and the genetic markers of conjuagal plasmid traA, trbC an...