Polymerase chain reaction detection of Lactobacillus acidophilus in human oral cavity and fecal samples after 2-week consumption of yoghurt.

Objective: To investigate whether short-term daily consumption of yoghurt leads to colonization by Lactobacillus acidophilus in a group of human subjects who were initially totally devoid of L. acidophilus in their oral cavities.

Material And Methods: Twenty-three volunteers consumed yogurt containing L.

Competition between yogurt probiotics and periodontal pathogens in vitro.

Objective: To investigate the competition between probiotics in bio-yogurt and periodontal pathogens in vitro.

Material And Methods: The antimicrobial activity of bio-yogurt was studied by agar diffusion assays, using eight species of putative periodontal pathogens and a 'protective bacteria' as indicator strains. Four probiotic bacterial species (Lactobacillus bulgaricus, Streptococcus thermophilus, Lactobacillus acidophilus, and Bifidobacterium) were isolated from yogurt and used to rate the competitive exclusion between probiotics and periodontal pathogens.

Defect of cell wall construction may shield oral bacteria's survival in bloodstream and cause infective endocarditis.

Infective endocarditis (IE) is a rare but life-threatening infection. Bacteremia with organisms known to cause IE occurs commonly in association with invasive dental origin. Despite daily oral activities as well as professional dental treatments inducing bacteremia and the dental bacteremia as a risk factor of IE, the details of dental bacteria in the pathogenesis of IE are far from elucidation to date.