Uses advanced immunofluorescence-based lateral-flow technology in a sandwich design for qualitative detection of nucleocapsid protein from SARS-CoV-2. The Sofia SARS Antigen FIA, with the Sofia 2 and Sofia analyzers, provides automated and objective results in 15 minutes, allowing for COVID-19 testing of symptomatic patients within the first 5 days of symptoms and asymptomatic patients when tested serially.