Carl Heneghan

Why Covid cases in England aren’t actually rising

A testing centre in Leicester (photo: Getty)

The government has restricted the movements of millions of people in England because Covid is apparently on the rise. But what happens when you start digging into the data?

I have used two datasets to piece together the number of tests, cases and results for Pillar 1 tests (which are done in healthcare settings) and Pillar 2 tests (which are done in the community).

Looking at the data for July, by the date PCR tests are reported, you can see a trend for an increased number of cases detected (from about 500 to nearly 750 a day). If you then look at the date the actual tests were taken, the trend is still apparent:

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Now all things being equal, the increase in cases is about 250 per day over a month – not an exponential rise and no sudden jump.

Written by
Carl Heneghan
Carl Heneghan is professor of evidence-based medicine at the University of Oxford and director of the Centre for Evidence-Based Medicine

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