Is "testing" only good for those that are positive with the virus?

[Moostache]

5. Here's the nightmare scenario...

Day 1 - 10 employees, 10 tests, all negative...
Day 2 - 10 employees, 10 tests, all negative...
Day 3 - 10 employees, 10 tests, one positive...

Effective Quarantine rules would state the remaining 9 employees would need to be quarantined for 14 days in isolation, and monitored for symptoms or tested further. daily..BUT, the virus may have a longer incubation period (unknown at present), but that would make the countermeasures ineffective as well...or, it may have actually been in all 10 employees, meaning that ANYONE they contacted might also have been exposed and so on...

Those 10 exposed employees may have unwittingly infected HUNDREDS of others without ever even showing symptoms or having a bad day...which is why this virus is unlike others of the recent and not so recent past. 1917-1918 Influenza may be a good example of how to effectively combat the spread of the virus, but the fact is eventually 70-80% of the total population is likely to be exposed and/or infected. Our preventative measures are only meant (and only capable of) preventing an over-run of the hospitals and healthcare system as a whole.

The only way this can be 'fixed' is identification of a vaccine and world-wide distribution of said vaccine. Otherwise, we are going to be exposed to COVID-19 for years like a plague...