CD40LG and Venous thrombosis: Another study of 100 hospitalized patients with COVID-19 (median age 65 years) proposed that certain biomarkers of platelet activation are associated with thrombosis or death in patients hospitalized with COVID-19.54 Specifically, plasma levels of thromboxane B2 (TxB2) (P = 0.006), P-selectin (P = 0.005), soluble CD40 ligand (sCD40 L) (P = 0.016) and mean platelet volume (MPV) (P = 0.012) were independently associated with the composite of thrombosis or death.