[INTESTINAL FAILURE AND YERSINIA PSEUDOTUBERCULOSIS TRANSLOCATION IN THE DEVELOPMENTOF EXPERIMENTAL GENERALIZED INFECTION].

THE OBJECTIVE: To determine the value of intestinal failure and translocation of bacteria Y. pseudotuberculosis, and normal intestinal microbiota in the initiation and generalization of infection in experimental pseudotuberculosis in conventional white mice, as well as pathological manifestation of it as a response to the adhesion and colonization of the mucosus membrane by pathogenic bacteria Y. pseudotuberculosis. MATERIALS AND METHODS: Experimental models of pseudotuberculosis in conventional white mice used the pathogenic Y. pseudotuberculosis 147 serotype I strain, containing a calcium-dependence plasmid with a molecular weight of 47 MDa. Cultivation of the pseudotuberculosis pathogen given its psychrophilic was performed on Hottinger agar at a temperature of (4-5) °C. The lactobacilli strain L plantarum 8P-A3 was isolated from a lyophilized commercial probiotic Lactobacterin (manufactured by "NPO Microgen", Russia) and used to obtain native culture supernatant fluid of lactobacilli, the composition of which was detected by gas-liquid chromatography with mass-selective detection. Gentamicin for parenteral administration was manufactured by JSC "Biochemist", Russia. Pathomorphological examination was performed on the 4-6th day of the experiment. Fragments of the small intestine, liver, kidneys, and lungs from dead animals were chosen for examination. Tissues were fixed in 10% neutral formalin, dehydrated in isopropanol and embedded in paraffin. Preparations were stained with Ehrlich hematoxylin and eosin, examined on the microscope "Mikmed-2" (JSC "LOMO", Russia) under magnification x 200-x1000. Statistical processing of the experimental results was carried out according to the method of Kerber in modification of I.P. Ashmarin and A.A. Vorobyov. RESULTS: The role of intestinal failure and translocation of bacteria Y. pseudotuberculosis, and normal intestinal microbiota in the initiation and generalization of infection in animals has been found. It has been proved that the oral administration of supernatant fluid containing microbial metabolites to animals as intramuscular administration of gentamicin equally prevent the development of generalized pseudotuberculosis and intensity of pathomorphological changes in the intestine and other organs of animals. CONCLUSION: Metabolites of the probiotic lactobacilli strain L plantarum 8P-A3 jugulate the development of pseudotuberculosis at an early stage of the pathological process in experimental animals infected with pathogen Y pseudotuberculosis, not only causing the preservation of the colonization resistance of the intestinal mucosa that prevents the adhesion and colonization of the pathogen, but also through their antimicrobial impact on the dissiminated pseudotuberculosis patho-gen bacteria in animals.

[COMPARATIVE EXPERIMENTAL EVALUATION OF THE EFFECTIVENESS OF MODERN PROBIOTICS, PREBIOTICS, SYNBIOTICS AND METABIOTICS FOR CORRECTION OF INTESTINAL MICROBIOCENOSIS IN ANIMALS WITH ANTIBIOTIC-ASSOCIATED DYSBIOSIS].

Probiotics for decades were leading in the arsenal of tools for correction of intestinal microbiocenosis. However, the response of representatives of intestinal microbiota to enteral intake of probiotics is variable, and in some individuals may be missing. Despite the fact that scientists still disagree on the necessity of forced settlement of normal microbiota at intestinal dysbiosis, large number of medicinal products, functional foods, dietary supplements, which efficiency is not always straightforward, is available for sale. The results of comparative experimental study of the effectiveness of 18 modern preparations for correction of intestinal microbiocenosis at antibiotic-associated dysbiosis in animals are presented. Conclusion is done on the need to evaluate efficacy and safety of tools developed for intestinal microbiota correction in animal experiments, followed by confirmation of clinical trials.