MX1 and infection: In a ROC analysis for differentiation between microbiologically proven viral (n = 18) and bacterial (n = 17) infections, POC MxA level and POC MxA (μg/L) to CRP (mg/L) ratio resulted in AUCs of 0.96 (95% CI, .89–1.00) and 0.99 (95% CI, .97–1.00), respectively (Supplementary Figure 2).