“One mutation, and the vaccine becomes ineffective.”
What FactCheck.org found
It’s taken numerous mutations for the effectiveness of the COVID-19 vaccines to decline against a new variant — and even then, the vaccine still provides some protection against severe disease.
Their words, from the summary they publish with the rating.
In short
Robert F. Kennedy Jr. made this claim around 5 August 2025. FactCheck.org (United States) looked into it and published its finding on 7 August 2025, 2 days later. Its rating was “False”.
Robert F. Kennedy Jr. has 55 checked claims in this archive. Fact-checking organisations rated 27 of them false or fake, 27 misleading or mixed and 0 true.
Where the claim appeared
Links recorded by FactCheck.org. Some posts may have been deleted since.
This check was done by FactCheck.org, not by DoesItStand. We list it so you can find it. Their full evidence and reasoning are in their article.