Univariate correlations between indicators of disease severity and viral RNA levels in plasma and cell fractions collected on fever day-2.

Correlations between viral RNA levels in plasma and cell fractions on fever day −2 and indicators of disease severity were analyzed by Spearman's Rho test. Multivariate non-parametric test of independence revealed that plasma viral RNA levels and viral RNA levels in CD14+ cell fraction independently correlated with pleural effusion index (P = .001).