London – A study led by UK’s Public Health England has shown people who took the first dose of either the Pfizer or AstraZeneca vaccines – and who became infected three weeks later – were between 38 per cent and 49 per cent less likely to pass the virus on than unvaccinated people. It showed protection against Covid was seen from about 14 days after vaccination, with similar levels of protection regardless of age of cases or contacts, PHE was quoted as saying in a statement. Dr Mary Ramsay, head of immunisation at PHE, said: “Vaccines are vital in helping us return to a normal way of life. Not only do vaccines reduce the severity of illness and prevent hundreds of deaths every day, we now see they also have an additional impact on reducing the chance of passing Covid-19 on to others.” The study included over 57,000 contacts from 24,000 households in which there was a lab-confirmed coronavirus case that had received a vaccination, compared with nearly one million contacts of unvaccinated cases. The report showed households are among the most likely places for infection to spread.