CD40LG and COVID-19: The lowest sensitivity was 27.39% (21.02–34.84) observed with the 2019-nCOV IgG/IgM Rapid test Device (HANGZHOU REALY TECH), and the highest was 61.67% (49.02–72.91) obtained for the STANDARD Q COVID-19 IgM/IgG Combo SD Biosensor.