[Interrelation between the presence in enterobacteria of distinct biological properties and their capacity to colonize the small intestine in the early stage of the development of postradiation dysbacteriosis].

An increase in the percentage of antibiotic resistant and hemolysin-producing enterobacteria occurring in the process of the development of postradiation intestinal dysbacteriosis was due to a sharp increase in the number of such bacteria among the representatives of the genera inhabiting the large intestine of mice (E. coli, E. aerogenes, E. cloacae, P. morganii) and to the appearance of antibiotic-resistant and hemolysin-producing strains in the intestinal tract; these strains belonged to the genera which had not been detected in the intestines of the animals before irradiation. In postirradiation dysbacteriosis a considerable decrease in the percentage of colicin-producing strains was observed. The dissemination of enterobacteria in the small intestine of irradiated mice occurred as the result of exogenous and endogenous infection.