Bacterial beta diversity in infant feces by maternal H. pylori status and delivery mode. PCoA plot of bacterial communities using unweighted UniFrac distances in vaginally (n = 13) (A) or C-section (n = 9) (B) born infants. Unweighted UniFrac intragroup distances (C). PERMANOVA was used to test dissimilarity. The non-parametric P values were calculated using 10,000 Monte Carlo permutations.