Figure 4.

Elevation of Liver injury enhanced the risk of secondary infection. The levels of Lactate (A), Lactate dehydrogenase (B), Cholinesterase (C), Prealbumin (D), Albumin (E), and CO₂ (F) in mild/moderate COVID-19, severe/critical COVID-19 without risk of secondary infection and severe/critical COVID-19 with the risk of secondary infection were shown. Each group of samples was further divided into three groups according to the time post-symptoms, including day 0 to day 9, day 10 to day 30, and post day 30. The chosen level of statistically significance were *P < 0.01 and **P < 0.05, respectively.