A study in England is reporting that the coronavirus vaccines in use there can cut transmission of the disease by up to half.
The research, from Public Health England, focused on households and offers insight into one of the big unknowns over COVID-19 vaccinations - the extent to which they can keep you from passing it on to other people.
The study says people who became infected with the coronavirus three weeks after receiving one dose of Pfizer or AstraZeneca vaccine were between 38% to 49% less likely to pass it on to people in their home compared to those who were unvaccinated.
Mary Ramsay, head of immunization at PHE said that "while these findings are very encouraging, even if you have been vaccinated, it is really important that you continue to act like you have the virus."
The study included over 57,000 contacts from 24,000 households in which there was confirmed case that had received a vaccination, compared with nearly 1 million contacts of unvaccinated cases.