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Adherence of clumping-negative and clumping-positive E. faecalis (A) and E. faecium (B) strains to Caco-2 cells before and after induction with sex pheromones produced by E. faecalis strain JH2-2 or OG1RF. The efficiency of adherence is expressed as the percentage of the inoculum remaining attached to eukaryotic cells and was calculated as follows: percentage of adhering bacteria = (number of adherent bacteria × 100)/number of bacteria in inoculum.
