[Antibiotic resistance of Escherichia of varying origin].

Antibiotic resistance of enteroinvasive E. coli strains (O151:K-), i.e. the levels, associations and localizations of the genetic determinants was studied. The strains were isolated in an Infants' Home. The study was performed with the comparisons to the pathogenic and ordinary E. coli strains of another origin. It was shown that the pathogenic strains were mainly resistant to streptomycin, kanamycin and chloramphenicol. The resistance was due to the R plasmids. No correlation between the pathogenic serogroup and any combination of the markers was observed. The enteroinvasive E. coli strains isolated in the Infants' Home were characterized by a one-type combination of the markers, a one-type resistance level and a one-type plasmid pattern, as well as by increased levels of the chromosomal resistance to kanamycin and streptomycin.