The study is here [1]. The relevant passage is: "Of those who reported having experienced symptoms of COVID-19 in the last seven days, only 18.2% (95% CI 16.

The study is here [1]. The relevant passage is: "Of those who reported having experienced symptoms of COVID-19 in the last seven days, only 18.2% (95% CI 16.4 to 19.9) said they had not left home since developing symptoms." There's a big difference between complete noncompliance (not isolating at all), or incomplete compliance (reducing social contact but not strictly complying with the guidelines). They don't seem to try to measure the extent of the behavioural change amongst the 82% who left the house. [1] https://www.kcl.ac.uk/news/effective-test-trace-and-isolate-needs-better-communication-and-support https://www.kcl.ac.uk/news/effective-test-trace-and-isolate-...