HOW TO USE AN AT HOME COVID-19 RAPID ANTIGEN TEST CORRECTLY? COVID-19 rapid antigen test kits are lateral flow diagnostic devices which qualitatively detect SARS-CoV-2 spike or nucleocapsid protein in human nasal, nasopharyngeal, oropharyngeal or saliva samples. These tests can check for the presence of an active COVID-19 infection on the spot and deliver results...