Two tests had a kappa value of agreement with ELISA test between 0.2 and 0.4 (COVID-19 IgG/IgM RAPID TEST DEVICE (WB/S/P) Safecare Bio-Tech and 2019-nCOV IgG/IgM Rapid test Device Hangzhou Realy Tech). Here, CD40LG is linked to COVID-19.