SARS-CoV-2 Antigen Assay Kit (Colloidal Gold Method) This kit is used for the qualitative detection of specific antigen against novel coronavirus (SARS-CoV-2) in human specimens (Nasal swabs, oropharyngeal swabs, lower respiratory tract samples). Principle This kit adopts colloidal gold-based flow-through, lateral-flow immunoassay and capture method to detect specific antigen against coronavirus in human specimens(Nasal swabs, oropharyngeal swabs.