Although the onset of detection and duration of persistence of neutralizing IgM and IgG antibodies differ among studies, they were detectable in sera of most COVID-19 survivors (Alzaabiet al., 2021;Houet al., 2020;Iyeret al., 2020;Leeet al., 2010;Liet al., 2003;Ogegaet al., 2021;Petersenet al., 2021;Quet al., 2020;Sariol and Perlman, 2020). Here, CD40LG is linked to COVID-19.