CD40LG and COVID-19: Antiglycan antibody testing performed with the 816-printed glycan array (PGA) revealed antibodies (IgM and IgG) to numerous self-carbohydrates, including gangliosides, N-linked glycans, LacNAc derivatives (particularly LNnO), blood group H (type 1) antigen, and sialyl Lewis X in COVID-19 patients, which are not found in healthy individuals [15].