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This fact brief was originally published as an experiment to test the concepts behind fact briefs.

Readers should be aware that while there is still a lot of useful information in fact briefs like this one, not all of them reflect Gigafact's current methods and standards for fact briefs. If you come across any that you feel are out of date, don't hesitate to contact us at support@gigafact.org.

FACT BRIEF

Is there a consensus on whether people vaccinated against COVID-19 are less likely to transmit the virus?

Tuesday, November 9, 2021

By Lisa Freedland

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The medical community currently lacks consensus on whether people vaccinated against COVID-19 are less likely to spread the virus than unvaccinated people.

New Scientist cited several studies that found vaccinated individuals infected with COVID-19 are between 63% and 89% less likely to transmit the virus.

However, a Lancet study published October 29 found that while vaccination "reduces the risk of Delta variant infection and accelerates viral clearance," once infected, vaccinated individuals transmit the virus at similar rates to unvaccinated individuals.

Nature offers a third take, reporting that vaccinated individuals infected with COVID-19 are initially less likely to transmit the virus, but the "protective effect...dwindles alarmingly" three months after vaccination.

This fact brief is responsive to conversations such as this one.

Sources

New Scientist How much less likely are you to spread COVID-19 if you're vaccinated?

The Lancet Community transmission and viral load kinetics of the SARS-CoV-2 delta (B.1.617.2) variant in vaccinated and unvaccinated individuals in the UK: a prospective, longitudinal, cohort study

Nature COVID vaccines cut the risk of transmitting Delta — but not for long

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Gigafact

Between 2020 and 2022, under close editorial supervision, Gigafact contracted a group of freelance writers and editors to test the concepts for fact briefs and provide inputs to our software development process. We call this effort Gigafact Foundry. Over the course of these two years, Gigafact Foundry writers published over 1500 fact briefs in response to claims they found online. Their important work forms the basis of Gigafact formats and editorial guidelines, and is available to the public on Gigafact.org. Readers should be aware that while there is still a lot of relevant information to be found, not all fact briefs produced by Gigafact Foundry reflect Gigafact's current methods and standards for fact briefs. If you come across any that you feel are out of date and need to be looked at with fresh eyes, don't hesitate to contact us at support@gigafact.org.

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About fact briefs published on Gigafact

Fact briefs are short, credibly sourced summaries that offer “yes/no” answers in response to claims found online. They rely on publicly available, often primary source data and documents. Fact briefs are created by contributors to Gigafact —a nonprofit project looking to expand participation in fact-checking and protect the democratic process. See all fact briefs here.