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How effective are coronavirus vaccines at stopping transmission?

A man receiving a dose of the Pfizer-BioNTech covid-19 vaccine in France

REUTERS/Stephane Mahe

People who have been vaccinated against covid-19 can still catch and transmit the virus, but are significantly less likely to do so than unvaccinated people, the latest data suggests.

The question of whether vaccines halt transmission is one of the biggest and most important unknowns of the pandemic. If they do, vaccine-induced herd immunity may be possible. If not, the virus will still be able to circulate even in a fully vaccinated population and continue to pose a deadly threat to people who cannot be …

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