Originally Posted by
samyoull
But how does that keep SARS-CoV-2 out of the country?
A negative test can mean:
* False Negative. Returns negative when test should return positive.
* Too early in infection to test positive
* Actually have no SARS-CoV-2 in body.
In some ways better not to test and put people in isolation, as if people are option 1 or 2 they will think they are fine and go a spread SARS-CoV-2 everywhere. Which is the opposite of what you want.
Tests are only helpful when test at the right time and fully understand what the results could mean.