of 85 epec strains tested for the presence of factors of virulence ( fimbrim , enterotoxins , haemolysins , colicins ) and factors of virulence against six antimicrobial substances ( tetracycline , streptomycin , chloramphenicol , kanamycin , ampicillin , sulfamethoxidine ) only three strains did not possess any of the mentioned factors .
C1136254
antimicrobial substances
C0039644
tetracycline