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All the evidence so far says the more you're exposed to it, the more risk you're at. Hence big events not actually being that risky, despite all the panicking on here and elsewhere. You are much more likely to catch it from family and close friends, unless you're a medical professional.
I agree it's possible to test people and not be at risk with the right PPE but we've had posts here about NHS workers wearing badly fitting dust masks so I can't see that going well. Either way it would mean critical PPE and resources being diverted to people who don't really need it. The estimate is that up to 80% of us will get the virus, it just doesn't seem viable or the best use of our (scarce) resources to me.
I wonder if this is true. I suspect not, given that S Korea seems to be currently held as having the best response to the virus. I imagine that mass testing would absolutely allow you to deploy your medical staff much more appropriately in better targeted ways, which may actually contribute to their safety.
But obviously this is just conjecture - I can see there's a case either way.