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I read that South Korea has provided the best testing regime of all affected countries - even making stuff like drive through tests available.
I don't know how quite how this would have affected the death rate (or at least the death given infection rate), but I understand that they were able to track and slow the spread very efficiently, even without mass lockdowns.
Article here, there's likely better ones available:
https://edition.cnn.com/2020/03/09/asia/south-korea-coronavirus-intl-hnk/index.html
Why is the death rate so low in South Korea?