Fig. 3From: The treatment of Qibai Pingfei Capsule on chronic obstructive pulmonary disease may be mediated by Th17/Treg balance and gut-lung axis microbiotaAnalysis of the microbial diversity of the gut contents (A–C) and BALF (D–F). Comparison of alpha diversity (as assessed by the Chao 1 (A, D) and Simpson (B, E) indices) and beta diversity (as assessed by the PCoA (C, F)). *P < 0.05, **P < 0.01Back to article page