Fig. 5

a, b Pie charts of the abundance ratio of the bacteria in terms of phylum level in Group Prior and Group Post are depicted. c, d Cluster analysis of the relative abundances in Group Prior and Group Post with the Bray–Curtis distance are shown. e, f Bar charts of the relative abundances among all samples with the Bray–Curtis distance are presented. g, h The relationship between the 14 samples and the abundance of the top 30 phyla and genera is presented by the two heatmaps in which the Z value was used to normalize the expression abundance of the same bacteria. The gradient from blue to red reflects the change in abundance from low to high. i, j Circos charts show the correspondence between samples and species from phylum and genus level, reflecting the composition ratio of dominant species in Group Prior and Group Post, and reflecting the distribution ratio of each dominant species among the two groups are depicted