Digital measurement of SARS-CoV-2 transmission risk from 7 million contacts.

ABSTRACT: How likely is it to become infected by SARS-CoV-2 after being exposed? Almost everyone wondered about this question during the COVID-19 pandemic. Contact-tracing apps^1,2 recorded measurements of proximity³ and duration between nearby smartphones. Contacts-individuals exposed to confirmed cases-were notified according to public health policies such as the 2 m, 15 min guideline^4,5, despite limited evidence supporting this threshold. Here we analysed 7 million contacts notified by the National Health Service COVID-19 app^6,7 in England and Wales to infer how app measurements translated to actual transmissions. Empirical metrics and statistical modelling showed a strong relation between app-computed risk scores and actual transmission probability. Lon

SUBMITTER: Ferretti L 

PROVIDER: S-EPMC10830410 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature