"Quantifying SARS-CoV-2 Transmission Risk: Insights from 7 Million Contacts"
Originally Published 2 years ago — by Nature.com
A study analyzing 7 million contacts recorded by the NHS COVID-19 app in England and Wales found a strong correlation between app-computed risk scores and actual transmission probability of SARS-CoV-2. The study revealed that longer exposures at greater distances had similar transmission risk to shorter exposures at closer distances. The probability of transmission increased linearly with the duration of exposure and continued to increase over several days. Households accounted for 6% of contacts but 40% of transmissions. The findings suggest that digital contact tracing can provide precise risk analysis to inform public health measures during a pandemic.