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Relative abundances of the top five most abundant bacterial phyla in the salivary (A) and nasopharyngeal (B) microbial communities of SARS-CoV-2-positive subjects and SARS-CoV-2-negative controls. Statistical significance was assessed using Mann-Whitney U test and analysis was adjusted for multiple comparisons using the Benjamini-Hochberg method. *, P < 0.05; **, P < 0.01.
