CorDx Tyfast SARS-CoV-2/Flu A+B Rapid Antigen Test CorDx Tyfast SARS-CoV-2/Flu A+B Rapid Antigen Point-of-Care Test is a lateral flow immunoassay intended for in vitro rapid, simultaneous qualitative detection and differentiation of nucleocapsid antigen from SARS-CoV-2, influenza A and influenza B directly from anterior nasal swab specimens obtained from patients who are suspected of COVID-19 by their healthcare provider, within the first five days of onset of symptoms. https://rcshcg.com/products/cordx-tyfast-sars-cov-2-flu-a-b-rapid-antigen-test-1?_pos=1&_sid=c05cf9846&_ss=r