Fig. 3

No influence of genetics on sharing of strains or species between mother and child. Violin plots with embedded box and whisker plots are shown here comparing the distribution of mother-child distances in the biological, adoptive, unrelated biological, and unrelated adoptive groups, for the three sampling sites, at strain (top panel) and species level (bottom panel). No significant difference was observed in the mother-child dissimilarities for the biological and adoptive groups, at either species or strain levels, across the 3 distinct habitats within the oral cavity. Biological vs adoptive statistical comparisons were performed using Wilcoxon rank sum test, and related/unrelated comparisons were performed using a comparable permutation-based test (see “Methods” section). Significance levels: ns: p > 0.05, *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001