CD40LG and viral infectious disease: With respect to the role played by anti-SARS-CoV-2 IgA antibodies in preventing viral infection, Sterlin et al. [21] showed that the early neutralizing antibody potential seems to be predominated by antibodies of the IgA class, whose appearance is comparable to that of IgG antibodies, but seems significantly earlier than that of antibodies of the IgM class.