Findings from the latest REACT-1 study show COVID-19 infection rates are three times lower for double vaccinated people


Study findings covering 24 June to 12 July from Imperial College London and Ipsos MORI show fully vaccinated people were three times less likely than unvaccinated people to test positive for COVID-19.

Over 98,000 volunteers took part in the study in England between 24 June and 12 July to examine the levels of COVID-19 in the general population. The latest data show infections in England have increased fourfold from 0.15% to 0.63% since the last REACT-1 report which covered the period 20 May to 7 June.

Despite this increase, the findings indicate the spread of the virus was slowing as of 12 July and infection rates for double vaccinated people are three times lower than in those who are unvaccinated.

Some of the main findings include:

  • 527 positives from 98,233 swabs, giving a prevalence of 0.63%, or 1 in 160 people, compared with 0.15% between 20 May and 7 June—more than a four-fold rise
  • unvaccinated people were three times more likely than fully vaccinated people to test positive for COVID-19, with a prevalence of 1.21% and 0.40% respectively
  • double vaccinated people in the most recent round were estimated to have around 50 to 60% reduced risk of infection, including asymptomatic infection, compared with unvaccinated people.

Health and Social Care Secretary, Sajid Javid, said: ‘Our vaccination rollout is building a wall of defence that means we can carefully ease restrictions and get back to the things we love, but we need to be cautious as we learn to live with this virus.

‘Today’s report shows the importance of taking personal responsibility by self-isolating if you are contact traced, getting tested if you have symptoms and wearing face coverings where appropriate.’

Robust population surveillance studies like this are essential to understanding the rate of COVID-19 infection, how the virus is spreading across the country, and the impact of measures taken to contain the virus in order to inform current and future actions.