INFLUENCE OF THE DURATION OF MAINTENANCE OF CULTURES IN THE LABORATORY AND THE IMPACT OF ELIMINATING AGENTS ON THE ANTIBIOTIC RESISTANCE OF ENTEROBACTERIA
Strains isolated from the natural environment were less resistant to antibiotics than laboratory strains. Microorganisms showed maximum resistance to ampicillin. After exposure to ethidium bromide the percentage of identified antibiotic-resistant strains to antibiotics, at least to one of their concentrations, decreased. The percentage for strains isolated from a natural reservoir decreased by 43 percent, for laboratory strains by 10 percent. After treatment of laboratory strains with acridine orange a similar change in the average percentage was not observed at all, the percentage for strains isolated from a natural reservoir decreased by 5 percent