drug resistance of 186 e. coli strains isolated in 1977-1978 from patients and carriers , as well as from the environment was studied with respect to 8 widely used antimicrobial drugs , i.e . tetracycline , streptomycin , chloramphenicol , ampicillin , neomycin , kanamycin , nalidixic acid and sulfanilamides .
C1136254
antimicrobial drugs
C0039644
tetracycline