Interestingly, a recent study comparing IgG and IgM antibodies in asymptomatic and symptomatic qRT-PCR-positive individuals demonstrated that asymptomatic individuals had a weaker immune response to SARS-CoV-2 infection and rapid decline in IgG levels [9], although other studies found that IgG levels against the spike proteins were sustained for 5–7 months after infection [10]. Here, CD40LG is linked to infection.