A trial, based on more than 98,000 people in England, found that if a double-jabbed person came into contact with a person who had COVID-19, only one in 25 would catch the virus.
The findings showed that the percentage of those who tested positive for the virus was 0.4 percent among the double-jabbed, compared to 1.21 among those unvaccinated.
Steven Riley, professor of infectious disease dynamics at Imperial College London, said the study showed that double-jabbed individuals are “taking a decent chunk of potential transmission out of what may or may not happen in September.”
He added: “There has been a drop, a plateau now, and I think it is challenging to make any kind of prediction over the summer months.
