Fig. 6

The periodontitis salivary microbiota could persist in the intestinal tract for at least 24 h. a An experimental flowchart indicating how the salivary microbiota is processed and transplanted into mice (n = 6 in each group). b The concentrations of microbial suspensions from the PH and SP group were measured by OD₆₀₀. Data were expressed as the mean ± SD. Statistical significance was determined using the t-test. c The mean fluorescent intensity of unstained and stained microbial suspensions from the PH and SP groups. Data were expressed as the mean ± SD and were compared to data from the unstained PH salivary microbiota. Statistical significance was determined using one-way ANOVA. d–g The distribution of fluorescence-positive bacteria in the gastrointestinal tract (small intestine, caecum, and colon) at 2 and 24 h after gavage. Data were compared to the Con-PH-S group and expressed as the mean or mean ± SD. Statistical significance was determined using one-way ANOVA. *P < 0.05