CD40LG and COVID-19: In an early COVID‐19 study, the blood antibody tests of 16 patients with COVID‐19 showed positive immunoglobulin M (IgM) and immunoglobulin G (IgG) rates of 50% (8/16) and 81% (13/16) on Day 10 of infection and rates of 81% (13/16) and 100% (8/16) on Day 15, respectively.31