CD40LG and COVID-19: Agreement between serological RDTs and the WANTAI SARS-CoV2 Ab ELISA was ‘fair’ for nine of the ten tests (kappa = 0.25 to 0.49), and ‘moderate’ for only one test, the STANDARD Q COVID-19 IgM/IgG Combo SD Biosensor (kappa = 0.61).