.@CDCMMWR finds #COVID19 antigen tests, which often offer results in <30 minutes, correctly came back negative for most people without COVID-19. However, for infected people, antigen tests correctly identified only 2 of 3 w/ symptoms, 1 of 3 w/o symptoms. https://t.co/miFqJz9xg9 https://t.co/LirRaaprDb