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One dose of COVID-19 vaccine can cut household transmission by up to half

04/05/2021

PHE's latest research shows that those who do become infected 3 weeks after receiving one dose of the Pfizer-BioNTech or AstraZeneca vaccine were 38%-49% less likely to pass the virus on to their household than those unvaccinated.

Protection was seen from around 14 days after vaccination, with similar levels of protection regardless of age of cases or contacts. This protection is on top of the reduced risk of a vaccinated person developing symptomatic infection in the first place, which is around 60 to 65% – 4 weeks after one dose of either vaccine.

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