New study shows how vaccinated people in a household are helping protect the unvaccinated

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A new, large study has found that vaccines play a key role in reducing the transmission of Covid-19 within families, which is likely to have implications for herd immunity and pandemic control.

The study published in JAMA Internal Medicine investigated how Covid-19 immunity within families could be associated with the risk for infection in family members not vaccinated.

The researchers enrolled 1 789 728 people from 814 806 families in Sweden. They used national data to assess people who acquired immunity from either previous Covid-19 infection or full vaccination until 26 May 26 2021.

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