Well I'm no epidemiologist! - but I have read that the only research done was in enclosed conditions and suggested that people should normally stay one metre apart (that is not the same as someone sneezing into your face, of course) and the metre was "doubled for safety" in the UK, but with different distances in other countries - suggesting not terribly robust science - and then the "two metres" was then applied outside, so if you were on a fishing boat in a gale in the North Sea, still two metres.
I understand the need for simple messages (KISS) for the population but on the other hand compliance with the "law" doesn't mean as an enquiring person you should not wonder what evidence there is that anyone has caught the virus from say a country stile...







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