Fig. 3

The short-chain fatty acids profiling in sera of COVID-19 patients. a–f Sera short-chain fatty acids concentration in healthy control, non-severe infection, non-severe recovery, severe infection, and severe recovery group (healthy control group, n = 10, non-severe infection and recovery group, n = 33, severe infection and recovery group, n = 7). g The heatmap is shown to represent the correlation between propionic acid and isobutyric acid and metabolic parameters. Data are shown as R-square. Error bars represent SEM. **P < 0.01. See also Supplementary Fig. S3