Technical Document 3: E↵ectiveness and Resource Requirements of Test, Trace and Isolate Strategies

Model Our model builds upon the individual-level model of Kucharski et al. [2020], and stratifies individuallevel transmissions by setting (household, work, school, other) from the BBC Pandemic data of 40,162 participants in the UK. It takes into account recent research on the COVID infection timeline as well as various logistical and temporal aspects of real-world implementations of TTI strategies, including: the inclusion of baseline symptom presentations in the COVID-free population, non-uniform infection profile, imperfect compliance with symptom reporting, isolating and quarantining, and non-negligible time durations needed for reporting symptoms, testing and tracing.