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Background. Production of numerous biologically active compounds and their metabolites by intestinal microflora, interaction with the immune and other systems is of great importance while studying its changes in various diseases, one of which is thyrotoxicosis. So, the purpose of this study was to determine the severity of intestine microbioma disorder in white rats with experimental thyrotoxicosis (ET). Materials and methods. Studies were carried out on 25 mature male white rats (15 — control group, 10 — research group). ET was simulated by intragastric administration of L-thyroxine for 14 days. Under sterile conditions a laparotomy was performed, a section (2–3 cm) of the large intestine with its contents was taken. Sterile 0.9% NaCl solution was added to the content. Series of ten-fold dilutions with a concentration of the initial mixture of 10–2 to 10–11 was prepared. From each test tube 0.01 ml was seeded on solid nutrient media with subsequent isolation and identification of microbes according to morphological, tinctorial, cultural and biochemical properties. Results. The results of the study demonstrated that in ET animals the main microbioma is represented by bacteria Bifidobacterium, Lactobacillus, Bacteroides, and also opportunistic enterobacteria (Escherichia, Proteus, Klebsiella), peptococcus, staphylococci and clostridia. This is accompanied by the elimination of Peptostreptococcus, Enterococcus from bacterial biotope and the contamination of K. oxytoca and staphylococci. There was a pronounced deficit of bifidobacteria by 42.81 %, lactobacillus by 22.57 %, normal intestinal bacillus by 16.48 %. By the population level, the coefficient of quantitative dominance and the significance factor, the leading place is occupied by bacteroids, role of which is increased by 21.72 %, and lactobacillus role decreases by 39.31 %, bifidobacteria decreases by 51.48 % and E. coli decreases by 57.49 %. In this case, the role of peptococcus 3.37-fold increases, clostridia by 4.53, and by 73.93 % by the number of proteus. Conclusions. Under conditions of ET, there is an elimination of Bifidobacterium, Lactobacillus, Peptostreptococcus, Enterococcus and contamination of the biotope with conditionally pathogenic enterobacteria (Proteus, Klebsiella) and staphylococci. Deficiency of bifidobacteria and lactobacilli leads to changes in taxonomic structure and formation of dysbiosis of II and III stage.
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