SARS-Cov-2 Antigen Rapid Test Cassette (Saliva Breath) is a polymer immunochromatographic technology and double antibody sandwich principle that is intended for the qualitative detection of the N protein antigen from SARS-Cov-2 in human saliva specimens directly. The identification is based on SARS-Cov-2 N protein antigen. Antigen is generally detectable in upper respiratory specimens during the acute phase of infection. It will provide information for clinical doctors to prescribe correct medications within the first seven days of symptom onset.