The tighter Covid restrictions introduced this week, along with larger fines for people who gather in groups of more than six or fail to self-isolate, followed a press presentation in which Sir Patrick Vallance and Professor Chris Whitty produced a graph showing new infections doubling every seven days until mid-October, when there would be 50,000 cases a day. Though Sir Patrick said it was ‘not a prediction’, it was widely treated as such. But are cases really doubling every seven days?
The daily figures for new confirmed cases are not the best guide to this, as they do not even nearly capture all infections. Moreover, they are partly a function of how many tests are being performed and where they are being performed. This week, for example, mobile testing facilities were sent to Glasgow university in response to an outbreak among students. Concentrating testing in areas of know outbreaks makes sense in many ways, but it is inevitably going to lead to an upsurge in confirmed cases.
What matters far more are the weekly figures from the Office of National Statistics’ Infection Survey Pilot.
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