Fig. 1

Diversity analyses show that the differences in the α- and β-diversities of the gut microbiota differ between the JIA and the control groups. a Comparisons of the Chao 1 and Shannon indices between the two groups. The two indices were significantly reduced in the JIA group compared to the control group (P = 0.0026 and 0.031, Wilcoxon test). b Venn diagram based on genera. The two groups have 83 shared genera, with 3 unique genera in the JIA group and 8 unique genera in the control group. c Ordination plot for the first two PCoA axes based on Bray-Curtis dissimilarity. The samples of the JIA and control groups are relatively clustered together, indicating that the Bray-Curtis dissimilarity differs between the two groups (P = 0.019, PERMANOVA test). d The phylogenetic tree was built using the OTUs greater than 0.3% (Additional file 2: Table S6). The OTUs in the plot are colored by phyla