CD40LG and COVID-19: While 1,332 individuals, which account for 3.77% (bootstrap 95% CI, 3.58%, 3.97%) of the cohort, tested positive for COVID-19 antibody (either IgM or IgG), 168 people (0.48%; bootstrap 95% CI, 0.40%, 0.55%) were positive for both IgG and IgM.