CD40LG and COVID-19: We used immunoblot analysis to investigate the serum of 12 COVID-19 patients with mild, moderate, or severe disease for the presence of IgM, -A, and -G isotype antibodies directed towards SARS-CoV-2 spike protein (S), receptor-binding domain (RBD) of SARS-CoV-2 spike protein (R), subunit 1 of the spike protein (S1), and ORF8 protein (O).