Coronavirus cases may be much fewer than reported(nytimes.com) |
Coronavirus cases may be much fewer than reported(nytimes.com) |
Every PCR positive cannot be called new infection, because both might be false. Not new, and not infected.
That's why everybody is putting the much better and cheaper antigen tests forward. Only when that is positive, a PCR test needs to be done. Antibody tests are highly unreliable, but antigen tests have no false positives. China tested a whole 5 mill city in a few days with antigen tests, Slovakia tested their entire population in two weekends.
The best test for testing infectiveness is the antigen test, and then you need a 2nd PCR test for confirmation that it is SARS-COV-2 and not some other common cold variant.