In addition, among the patients confirmed with COVID-19, the sensitivity, specificity, PPV, NPV, and consistency rate of IgM were 77.3% (51/66), 100%, 100%, 80.0%, and 88.1%, respectively, and IgG was 83.3% (55/66), 95.0%, 94.8%, 83.8%, and 88.9%, respectively, using the recombinant N protein of SARS-CoV-2 (Xiang F. et al., 2020). The gene discussed is CD40LG; the disease is COVID-19.