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Top abundant bacterial phyla in the gut and oral samples of patients with COVID-19 and healthy controls. Firmicutes, Bacteroidetes, and Proteobacteria were found to be the most predominant phyla across the sample groups. Each sample group is represented by a different color code. Violin dots with different letters (a▲, b▼) indicate significantly different read abundance at the phylum level between the gut and oral samples with Mann–Whitney U-test.
