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Sweden gambled and lost. Sweden's chief epidemiologist Anders Tegnell believed it would be possible to attain herd immunity. In May, studies in the worst afflicted region of Stockholm showed that only 7% of the population had had antibodies. The number of those who were asymptomatic or had had only mild symptoms was quite low. What that means is that the disease is quite severe but the good news are that one does not contract it very easily. Thus it should be more easily suppressed than previously thought.

Finland, Norway, Iceland and Denmark followed a similar strategy.

Yes, I know. I think the rest of Europe was watching the Swedish experiment closely (and then, they were glad they didn´t take the same approach).