While More People Identify Vaccine Myths as “Definitely False” than “Definitely True,” At Least Half Are Uncertain About What to Believe
June 30, 2026 - People who don’t have a trusted health care provider are more likely than people with one to believe or lean toward believing several common myths about vaccines, a new KFF Tracking Poll on Health Information and Trust reveals. Similarly, people who use social media or artificial intelligence (AI) chatbots at least weekly for health information are more likely than those who don’t to endorse these false vaccine claims.
One example: Among adults who say they do not have a doctor or other health provider they trust to answer questions about their health, about 4 in 10 (39%) incorrectly believe that it is either “definitely” or “probably true” that MMR vaccines have been proven to cause autism in children, compared to a quarter (24%) among those who say they have a trusted provider.
Similarly, more than a third of people who report using social media (37%) or AI chatbots (35%) at least weekly for health information incorrectly say this myth is true, about twice the share among those who never use social media (16%) or AI (20%) for health information.
The poll finds a similar pattern for most of the other vaccine myths tested for people without a trusted doctor as well as for people who frequently use social media or AI for health information. The differences remain significant even when controlling for other factors such as...
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