Comparison of supraglottic bacterial communities with first and second BAL microbiome. Relative abundances of Veillonella, Prevotella, Propionibacterium, and Staphylococcus in 15 subjects with paired supraglottic (S), first BAL (1), and second BAL (2). Veillonella and Prevotella are the two most abundant taxa in supraglottic samples while Propionibacterium and Staphylococcus are the two most abundant taxa in background. UniFrac distance to supraglottic and bacterial load adjusted per mL of BALF (log10 16S qPCR) are shown below the bar graph of relative abundance. Overall, first BAL is not consistently closer to supraglottic than second BAL.