But what is a Covid-19 antigen test, and how is it different from a Covid-19 PCR (polymerase chain reaction) test? Antigen tests work by detecting the presence of the coat, while PCR tests work by detecting the presence of the body. Covid-19 PCR tests also use samples from the back of the nose. Less sensitive, but fasterCovid-19 antigen tests are known to be less sensitive than the Covid-19 PCR tests. You may wonder then why are we using Covid-19 antigen tests at all if they are less sensitive than the Covid-19 PCR tests.

Source: The Star July 11, 2021 04:52 UTC