In a recent national COVID-19 seroprevalence study, conducted by the Institute of Epidemiology Disease Control and Research (IEDCR) in collaboration with icddr,b, the seroprevalence of COVID-19 IgG and/or IgM was found to be 45% in Dhaka city and 74% in the slums [30].. This evidence concerns the gene CD40LG and COVID-19.