Other findings in a systematic review by the Cochrane COVID-19 Diagnostic Test Accuracy Group indicate that the IgM test by ELISA showed sensitivities of 68.2% (95% CI: 57.1–77.5) and 84.5% (73.5–91.4) in the second and third week from the onset of the disease. The gene discussed is CD40LG; the disease is COVID-19.