SARS-CoV-2 Antigen Rapid Test (Sputum/Saliva/Stool) is intended for the qualitative detection of SARS-CoV-2 Antigen (Nucleocapsid protein) in human sputum, saliva and stool specimens in vitro. The positive results indicate the existence of SARS-CoV-2 antigen. It should be further diagnosed by combining the patient's history and other diagnostic information ^[1]. The positive results do not exclude bacterial infection or other viral infection. Pathogens detected are not necessarily the main cause of disease symptoms.