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World

The R-number – and the danger of false certainty

11 May 2020

5:48 AM

11 May 2020

5:48 AM

Not much about Boris Johnson’s Sunday night television address was clear. The one definite new measure – one which will shape coverage for weeks to come – is the UK’s new ‘COVID Alert Level’, a five-stage measure that the prime minister said would be determined primarily by ‘the R’ – the rate at which the virus grows.

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