Coronavirus infections three times lower in double vaccinated people


New research has found that double vaccinated people were three times less likely than unvaccinated people to test positive for the coronavirus.

These results from the Imperial-led REACT-1 study, a major coronavirus monitoring programme, are based on swab tests taken by almost 100,000 people in England between 24 June and 12 July. During this period, 0.63% of people were infected, or 1 in 158. This represents a 4-fold rise compared with the study’s previous report, when 0.15% or 1 in 670 had the virus as of 7 June.

People who were unvaccinated had a three-fold higher prevalence than those who had received both doses of a vaccine, at 1.21% compared to 0.40%. However both of these represent more than a five-fold increase compared to the previous round (0.24%, 0.07%, respectively). Based on these data, the researchers estimate that fully vaccinated people in this testing round had between around 50% to 60% reduced risk of infection, including asymptomatic infection, compared to unvaccinated people.

In addition, double vaccinated people were less likely than unvaccinated people to test positive after coming into contact with someone who had COVID-19 (3.84% vs 7.23%).