It needs to find eight in 10 people who have been in contact with someone who tests positive.
Of the 7,367 people who were reached, 18% were not able to give any recent close contacts. This was because either they had none or because they didn't have details of people they might have come into contact with - they could have been strangers who they sat next to on a bus journey, for example.
That leaves 6,044 people who provided details for one or more close contacts. NHS Test and Trace identified 32,359 of those recent close contacts and reached 69% of them - the lowest percentage since the service launched.It seems this figure - which was 80% for the previous week - was the one to which Mr Johnson was referring. Earlier on in his exchange with Sir Keir, the prime minister correctly qualified the number by saying"of those contacts who supply details, 80% are reached".
However, the advice from the government's scientific advisers refers to reaching at least 80% of contacts of all positive cases, regardless of how hard it is to get contact details.
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