TTR and coinfection: What's more, joint the serum prealbumin and CRP to establish a logistic regression equation has a better diagnostic significance for Omicron and Flu A/B co‐infection (Omicron vs. co‐infection: AUC = 0.934; Flu A/B vs. co‐infection: AUC = 0.887) (Figure 1C,D and Table S2).