Two new studies look at the Delta variant (B1617) behind the UK COVID-19 surge, with the first noting that young people are helping drive the exponential growth of COVID-19 cases in England.
The second study describes reduced COVID-19 vaccine and antibody efficacy against the more transmissible variant.Youth test positivity rate five times higher than seniors'The first study, published today on the Imperial College London preprint server, involved testing a random sample of people from across England for COVID-19 as part of the ongoing Real-Time Assessment of Community Transmission (React 1) study.The researchers showed that COVID-19 infections in England surged from May 20 to Jun 7, with a doubling time of 11 days and an estimated R