Variables with p < 0.1 including age, SARS-CoV-2 IgM titer, SARS-CoV-2 IgG titer, lymphocyte and platelet count, fibrinogen, aspartate aminotransferase, diabetes comorbidity, and ratio of arterial oxygen partial pressure (PaO2) to fraction of inspired oxygen (FiO2) were entered into a backward stepwise multivariate binary logistic regression model. The gene discussed is CD40LG; the disease is diabetes mellitus.