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Chalfie-
It is self report and then extrapolated but you have to put in daily if you have had a test and what the result was and they send you a test if you are displaying symptoms or displaying other symptoms that they ask you about and are trying to establish a connection and prevalance such as fatigue and headaches
greentricky
Latest from the Kings survey, 11,000 cases a day and doubling every 7 days:
https://twitter.com/timspector/status/1308282591527591941