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The lactobacilli probiotics maintain a normal vaginal biota and prevent disease recurrence. This microorganisms form a pellicle on the vaginal epithelium that acts as a biologic barrier against colonization by pathogenic bacteria. In this paper were realized assays of exclusion, competition, and displacement. For these test, vaginal epithelial cells, two strains of lactobacilli and pathogenic bacteria (Staphylococcus aureus, Streptococcus agalactiae and Listeria monocytogenes) were used. The lactobacilli strains showed a great capacity of adherence, with a mean of 83.5 ± 26.67 Lactobacillus fermentum cells and 56.2 ± 20.87 Lactobacillus rhamnosus cells per vaginal epithelial cells. L. fermentum and L. rhamnosus were able to reduce the adherence of S. aureus, S. agalactiae and L. monocytogenes in a significant level in this assay (P &lt; 0.01). The lactobacilli used in this study protect the vaginal epithelium through a series of barriers and interference mechanisms. The aim of present study was to assess the ability of vaginal Lactobacillus strains, selected for their probiotic properties, to block the adherence of pathogenic microorganisms in vitro by displacement, competition, and exclusion mechanisms.

current microbiology

Effect of Two Probiotic Strains of Lactobacillus on In Vitro Adherence of Listeria monocytogenes, Streptococcus agalactiae, and Staphylococcus aureus to Vaginal Epithelial Cells