Figure 4.

Comparisons of overall diversities of pathogens. (A) Alpha diversities were compared across different sample types (respiratory tract versus blood), SARS-CoV-2 status (detected versus undetected), age groups (15 to 70 versus 70 to 100), and severity (ICU versus non-ICU). The statistical significance of the comparisons (Wilcoxon test) is marked on top of the boxplot: * (p < 0.05); ** (p < 0.01); *** (p < 0.001). (B) Beta diversity was compared to the microbial compositions between respiratory and blood through the PCoA. The significant test of comparisons (PERMANOVA test) is annotated in the top-left position.