Earlier quoted context omitted.
If you want to come out of a lock-down without also causing the number of cases to spike again, we'll need to implement a widespread test-and-trace protocol similar to South Korea's. This requires _lots and lots_ of testing.
If you want to come out of lock-down, you really need a different test... you need a serological antibody test to tell if you've been exposed to the novel coronavirus (and thus have immunity from re-infection [0]). The current test can only tell you if you have an active infection. But before we can really open things up again, we'll need to know who is still at risk, and that requires the antibody test. There has be…
We very much still need to be able to test for people that currently have it - we're kind of starting from zero every time people come out of lock-down, so we need to test for outbreaks before they happen.