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I heard that South Korea had/has a very large supply of very accurate coronavirus tests. Probably lots of testing is also why their death rates are low (not only hospitalizable cases are counted). Maybe a significant motivator in these decisions is whether or not you can test a lot of people?

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A large number of available and accurate tests definitely mattered. But that is not merely enough, someone had to make decisions and coordinate the efforts. I have no idea who that was, but they did a great job.

And they have to do it EARLY. It is useless to compare or even worse suggest these solutions now.

EARLY is key. Experimenting theories in a scenario like is so risky - difficult to understand why the UK went that way.

they weren't only testing everybody on a massive scale, they also assigned a team of like 5 people for every positive case to trace everyone they could have come in contact with

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