"Revolutionary Contact-Tracing Software Accurately Assesses COVID-19 Risk"
A study conducted in the UK analyzed data from the NHS COVID-19 app and found that the app accurately translated the duration and proximity of a COVID-19 exposure into a relevant epidemiological risk score. The app's risk score was associated with an increasing probability of infection, with higher-risk contacts more likely to test positive for COVID-19 within two weeks. Duration of contact was found to be the most important indicator of risk, with household exposures accounting for a significant portion of transmissions. The study suggests that including contextual variables and an intermediate risk stage in contact-tracing apps could improve risk assessment and reduce the socioeconomic costs of contact tracing.