CRP and COVID-19: Tonduangu and colleagues [8] demonstrated in a multi-centre study of 1035 patients that the ratio between lymphocyte and CRP achieved reasonable diagnostic performance for predicting severe COVID-19 (AUC 0.679; cut-off 78.3; sensitivity 79%, specificity 47%) and mortality (AUC 0.607; cut-off 159.4; sensitivity 48%, specificity 70%) [8].