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Jae C. Hong/AP One dose of a Pfizer of AstraZeneca vaccine cut household transmission by up to 50% in a study. Protection kicked in from 14 days after vaccination regardless of age, Public Health England said. It remains unclear how long protection from one dose lasts for. A single dose of the Pfizer or AstraZeneca COVID-19 vaccine cut the spread of coronavirus within a household by up to 50% in a new study. People who had one dose of either vaccine were between 40% and 50% less likely to pass on the virus to people in their household, 21 days after the shot, compared to those who weren t vaccinated at all, the study authors from Public Health England said in a preprint paper posted Wednesday. 

United kingdomMary ramsayDeborah dunn waltersPeter englishCenters for diseaseUniversity of surreyUniversity of oxfordPublic health englandBritish society for immunologyDisease controlUnited kingdom basedInsider thursdayBritish societyDr catherine schuster bruceஒன்றுபட்டது கிஂக்டம்மேரி ராம்சே