[Influence of Bacillus cereus on microbiocenosis of gastrointestinal tract in rats].

The modifying effect of Bacillus cereus on intestinal microbiocenosis was investigated in eubiotic and disbiotic female rats. Qualitative and quantitative characteristics of gut and mucosal microflora from different parts of rats' intestine were studied before and after intragastral application of B. cereus suspension. The single application of B. cereus suspension resulted in appearance of this bacterium in feces and in parietal mucin from all parts of the intestine. In eubiotic rats compared with disbiotic, B. cereus adhere to parietal mucin much more efficiently and supplanted indigenous microflora. During disbiosis B. cereus sometimes had stimulating effect on the intestinal microbiocenosis. Gut microbiocenosis appeared to be more resistant to B. cereus invasion than mucosal. This fact was considered to be the evidence of higher sensitivity of mucosal microbiocenosis to short-term influence of exogenous microbial factor.