Fig. 2

Aerosol microbiota is compositionally distinct from sputum: (a) paired α-diversity (Shannon index) using Friedman test for bag, filter, and sputum. (b) β-diversity (Bray-Curtis dissimilarity index), shows distinct clustering of sputum and aerosols. Volcano plots showing differentially abundant taxa in (c) bag vs. sputum, and (d) filter vs. sputum. Taxa that are considered discriminatory appear above threshold (marked by the red dotted line, FDR = 0.2). The size of the dots corresponds to the relative abundance of the taxa