[rossdavidh]

80%...in asymptomatic cases. So if most of the people who get tested DID show symptoms, the false positive rate generally could be far worse.

But, it would suggest downsides to more general testing.

[dnautics]

But if your diagnostic criteria is showing symptoms later, then you are ejecting the entire population of carriers who might be, say, teeming with the virus but showing zero symptoms, for perhaps a genetic or "dumb luck" reason.