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Please note!
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 If you come across any that you feel are out of date, don't hesitate to contact us at support@gigafact.org.
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FACT BRIEF

Are the majority of infections by the delta variant of the coronavirus among the vaccinated?

By Austin Tannenbaum
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NO

Coronavirus infections among the unvaccinated far outnumber “breakthrough” infections among fully vaccinated people. “Almost all (more than 9 in 10) COVID-19 cases, hospitalizations and deaths have occurred among people who are unvaccinated or not yet fully vaccinated,” KFF reported on July 30.

KFF, a nonprofit focused on health-related policy and analysis, provides the best-available data, based on figures from December 2020 to July 2021 from the 25 states that track breakthrough infections of the virus that causes COVID-19.

Infections among the vaccinated were “below 1% in all reporting states,” KFF found. Hospitalization and death rates among the vaccinated were “effectively zero” in all but a few states.

No vaccine offers 100% protection. KFF notes that as more people become vaccinated, the relative number of cases among the vaccinated may rise, for the simple reason that “there will be fewer unvaccinated people in the population.”

This fact brief is responsive to conversations such as this one.
Sources
KFF COVID-19 vaccine breakthrough cases: Data from the states
Centers for Disease Control COVID-19 breakthrough case investigations and reporting
ABOUT THE CONTRIBUTOR
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.