Ministers are reportedly considering whether to relax the two-metre rule for social distancing in workplaces. But what is the science behind the measure?
Professor Lydia Bourouiba from the Massachusetts Institute of Technology used high-speed cameras to capture a cough projecting miniature specks as far as six metres.
And what's still not established is whether any virus that spreads further than two metres can still be infectious.That is why construction is typically among the first type of work to be allowed when lockdowns are eased., following up the contacts of the people infected. But there is a long way to go and confirming exactly the right distance is one of the unanswered questions.
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