[Pre-clinical trials of new spore probiotics]

The paper presents the results of a pre-clinical trial of Bacillus bacterial strains that are ingredients of biosporin, bisporin, and irilis, new Russian probiotic preparations. The study included determination of the cultural and biochemical properties of the probiotic strains, their antagonistic activity, adhesion ability, resistance to various biological liquids, and the length of their persistence in mouse alimentary tract. The listed properties were compared with those of foreign commercial preparations, bactisubtil and enterogermin. The study demonstrated high antagonistic activity of biosporin, bisporin, and irilis against many bacteria of different taxonomic groups, and Candidae. Besides this, the study showed that, unlike similar foreign preparations, the Russian ones were characterized by relatively low adhesive ability, short-term persistence, and absence of virulence factors. According to the results of the study, the most prospective probiotic strains for further clinical application are B. subtilis VKPM B-8611 and B. licheniformis VKPM B-8610, an irilis ingredient.