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World

The rule of four: how to make sense of Covid case numbers

25 September 2020

8:43 PM

25 September 2020

8:43 PM

Are Covid cases doubling or not? And if so, in what time frame? If you listened to Boris Johnson and chief scientific adviser Patrick Vallance, you’d be forgiven for being confused. The Prime Minister said this week:

‘The chief medical officer and chief scientific adviser warned that the doubling rate for new cases could be between seven and 20 days.

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