The NHS contact tracing app for England and Wales prevented at least 100,000 Covid-19 infections between October and December last year, a new study suggests.
Data collected from the app suggest somewhere between 100,000- 900,000 cases of Covid-19 were prevented by the app’s exposure notifications.
The study, which has been published in Nature, says that the contract tracing app sent around 1.7m exposure notifications in the last three months of 2020, as a result of 560,000 app users testing positive.
It estimates that around 6% of app users that receive a close contact notification will go on to report a positive test themselves – a similar rate to manual testing.
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The research was led by a team from Big Data Institute, part of the Li Ka Shing Centre for Health Information and Discovery at the University of Oxford. Using a mathematical model, the study authors then estimated the probability that notified contacts would be infected and quarantine in a timely fashion and as a result predicts that between 108,000 and 450,000 cases of Covid-19 were averted.
Further statistical analysis of the app data compared areas with similar demographics, but with differing levels of app uptake. It was suggested that the number of cases averted increased due to the app uptake. Thus, the research predicted that between 317,000 and 914,000 cases could have been averted during the study period.
The study authors suggest that although the two estimates differ, they agree that the contact-tracing app holds value in reducing virus transmissions. Their research also found that the average number of contacts traced by the app was more than double that of manual contact tracing, but the two systems can be complementary as they could help trace different contacts.
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Source: Press Association
