Fig. 2.

Kaplan–Meier curves for the 30-day mortality of the four types of infection groups. The figure presents the trend of the 30-day survival rate in each group. The log-rank test for reference groups versus laboratory-confirmed co-infection group was done and shown in the figure. Data after propensity score matching were used for the comparison, and the matching result of the laboratory-confirmed viral-bacterial co-infection group versus bacterial infection alone group was used as the co-infection group in this plot.