COVID-19 serological RDTs are antigen-antibody based tests that detects SARS-CoV-2 IgM and/or IgG in human blood samples or SARS-CoV-2 viral antigen from respiratory samples within 15 min.8,11,12 Unlike the RT-PCR protocols, serological tests require less expensive equipment, no technical expertise or electricity to run and very minimal biosafety requirements. Here, CD40LG is linked to COVID-19.