A total of 127 strains of Escherichia coli were isolated from swines in Distrito Federal, Brazil, tested for enterotoxin genes (STa, LT-I, LT-II, Stx1 and Stx2) and for antimicrobial resistance. Eight strains (6.3%) had enterotoxin genes, of which four (3.2%) were positive only for LT-I, three (2.4%) positive only for STa and one (0.8%) positive for STa and LT-I. There were no positive strains for LT-II, Stx1 or Stx2. When antimicrobial resistance was analyzed, the most resistant antibiotics were Lincomycin (100%), Sulfonamide (74.8%) and Tetracycline (70.1%), and the most sensitive antimicrobials were Norfloxacin (82.7%), Gentamicin (75.6%) and Sulfamethoxazole + Trimethoprim (63%). These results demonstrated the presence of enterotoxin genes and high numbers of antimicrobial resistance of E. coli strains isolated from healthy swines in Distrito Federal.
Escherichia coli; swine; enterotoxins; antimicrobial resistance
