Pfizer, AZ vaccines reduce transmission

Covid-19 vaccines deployed in England can cut transmission of the coronavirus in households by up to a half, data from Public Health England (PHE) showed on Wednesday, in addition to the protection against symptomatic infection. The research offers insight on one of the big unknowns -- the extent to which vaccines prevent transmission. Research showed that people who became infected three weeks after receiving one dose of Pfizer or AstraZeneca vaccine were between 38% to 49% less likely to pass it on to household contacts compared to those who were unvaccinated. The shots also stop a vaccinated person developing symptomatic infection, reducing the risk by around 60% to 65%. The study included over 57,000 contacts from 24,000 households in which there was a confirmed case that had received a vaccination,compared with nearly 1 million contacts of unvaccinated cases.