As a second pandemic wave breaks over much of the world, the need for sustainable
and effective test, trace, and isolate programmes is more pressing than ever. The
study by Michelle Kendall and colleagues1 in The Lancet Digital Health is thus welcome
and timely. This assessment of the effect of the pilot UK Test and Trace programme
on the Isle of Wight provides indirect, yet convincing, evidence of success in reducing
the effective reproduction number, and thereby the size of the first wave. However,
it is unclear how the programme will fare when expanded to settings that are less
ideal than the Isle of Wight, given its small population size and distinct natural
boundaries.

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