Fig. 1

Multiple rarefaction curves for all the alveolar lavage fluid samples. Multiple rarefaction curves of the (A) richness and (B) rank abundance (B). C Columnar cumulative chart of relative abundance of the top 20 species with the greatest abundance at the phylum, class, order, family, and genus levels. D Distribution of dominant bacteria in groups A1, A2, and B at the phylum and genus levels