A single covid-19 vaccine dose can reduce transmission of the virus in households by up to half, according to new UK data.
Prime Minister Boris Johnson says it's news that will be 'crucial' in beating the pandemic.
People who received one dose of either the AstraZeneca or Pfizer vaccine, and later became infected, were between 38% and 49% less likely to pass the virus on people who hadn't been vaccinated.
Over 33 million people in Britain have had at least one vaccine dose.
Public health expert Professor John Ashton says the new data should lead to a shift in the vaccination rollout.
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