An IgG/IgM lateral flow test strip typically consists of a sample pad for sample loading; a conjugation pad sprayed with gold COVID-19 conjugate (i.e., a surface antigen from SARS-CoV-2 conjugated to colloidal gold nanoparticles) together with gold rabbit IgG conjugate for control; a nitrocellulose membrane consisting of an M Line coated with anti-human IgM antibody, a G Line coated with anti-human IgG antibody, and a control line coated with anti-rabbit IgG antibody; and an absorbent pad for waste absorption [66]. The gene discussed is CD40LG; the disease is COVID-19.