These estimates represent the transmission of COVID-19 2 to 3 weeks ago due to the time delay between someone being infected, developing symptoms, and needing healthcare.
There is increased uncertainty in both national and regional estimates at present, due to changes in testing policy, which make trends in data streams less clear. UK Health Security Agency
See also:
- Independent report: REACT-1 study of coronavirus transmission: December 2021, final results UK Health Security Agency
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