The highly antagonistic lactobacillus strains isolated from the oral cavity of human individuals were genetically passported as L. fermentum 39, L. rhamnosus 50, and L. rhamnosus 24, by applying the RAPD-PCR technique with two types of primers (M13, MSP). These lactobacillus strains showed high degrees of autoaggregation, surface hydrophobicity, coaggregation, and adhesion. These characteristics determine the obvious capacity of lactobacilli to form biofilms, which may be used to design new probiotic agents.
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