Performance of the severe fever with thrombocytopenia syndrome virus load in urine (U-SFTSV) and SFTSV load in plasma (P-SFTSV) in predicting the outcome of SFTS patients. (A) Receiver operating characteristic (ROC) analysis of U-SFTSV and P-SFTSV to predict SFTS outcomes 28 days after onset. (B) Kaplan-Meier survival curve analysis was used to compare the difference in the 28-day survival probability between SFTS subgroups partitioned by the cutoff value (6379 copies/mL) derived via ROC analysis. AUC, ROC curve; CI, confidence interval.