Fig 3. Taxonomic summaries for the most abundant taxa at the phylum and genus levels.

The stacked and colored bars represent the relative abundance of the top five most abundant taxa in the upper respiratory mucosa of the study subjects. The other phyla or genera are categoized as “Others” and are shown in gray. Unclassified taxa with different ASVs but the same taxonomic name are distinguished by different numbers in square brackets. Abbreviations: RA, Rheumatoid arthritis; ASV, Amplicon sequence variant.