Covid-19: One dose of vaccine cuts risk of passing on infection by as much as 50%, research shows

Adults infected with covid-19 three weeks after receiving one dose of the Pfizer-BioNTech or Oxford-AstraZeneca vaccine were 38-49% less likely to pass the virus on to their household contacts than people who were unvaccinated, a preprint released by Public Health England has shown.1 The research looked at the proportion of […]