if you want to screen and have a test that you do more than once, you do it occasionally and frequently, if you want to find out i feel good, there is no reason to believe that i m infected but i want to make doubly sure then an antigen test is appropriate and works because even though it is not as sensitive as a pcr test, it gives you valuable information because if you re negative with your apt antigen test, the likef transmitting it because the virus is so low in your nasal cavity you re not likely to transmit it. there is a praise for screening saying i want to have dinner with family. i m vaccinated. i m boosted. i want to make doubly sure that i m safe. that s when you get an antigen test. i hope americans are