| antimicrobial resistance and virulence genes of escherichia coli isolates from swine in ontario. | a total of 318 escherichia coli isolates obtained from diarrheic and healthy pigs in ontario from 2001 to 2003 were examined for their susceptibility to 19 antimicrobial agents. they were tested by pcr for the presence of resistance genes for tetracycline, streptomycin, sulfonamides, and apramycin and of 12 common virulence genes of porcine e. coli. antimicrobial resistance frequency among e. coli isolates from swine in ontario was moderate in comparison with other countries and was higher in is ... | 2005 | 16269706 |