This kit uses double antibody sandwich immunoassay to detect specific antigens to SARS-CoV-2 in human throat or nasal cavity. The membrane was precoated with SARS-CoV-2 specific antibody on the test zone and goat anti mouse IgG antibody on the control zone. During the test, the specimen is allowed to react with SARS-CoV-2 specific antibody-colloidal gold particles conjugate, which was predried on the test. The conjugate binds to the SARS-CoV-2 forming an antibody~antigen complex. The complex moves forward on the membrane by the capillary action, then the complex is captured by specific antibody to SARS-CoV-2 on the test zone to produce a visual red color line. The color of line is positive correlated with the amount of SARS-CoV-2 in specimen. Regardless of the presence of SARS-CoV-2, as the mixture continues to move across the membrane to the control zone, the complex is captured by immobilized goat anti mouse IgG antibody to form a distinct red line.