ntigen testing could be a faster, cheaper way to diagnose covid-19

An antigen test, on the other hand, can deliver results on the spot. That means it’s suitable for frequent follow-up testing. You could use it in cases where you need a quick yes-or-no result, like in an overwhelmed hospital, at a nursing home where patients are not mobile enough to go to a testing site, or to determine whether health-care workers have been infected.  MITTechnologyReview