A new poll released Tuesday by health‑policy research firm KFF found that U.S. adults who regularly turn to artificial‑intelligence chatbots for health advice are more prone to endorse false claims about vaccines, including the discredited idea that shots cause autism.
The online survey of 1,500 American adults asked respondents how often they used AI tools such as ChatGPT, Gemini or other conversational agents for medical information. Those who reported “frequent” use—defined as at least once a week—were significantly more likely than infrequent or non‑users to agree with statements that vaccines are unsafe, that they contain harmful chemicals, and that they can lead to developmental disorders in children.
KFF’s analysis linked the higher belief in these myths to the way AI chatbots retrieve and summarize information from the internet, often without distinguishing reputable medical sources from misinformation. The firm warned that the ease of accessing AI‑generated health advice could amplify existing vaccine hesitancy, especially among groups already skeptical of traditional medical institutions.
Public‑health experts cited in the poll’s release emphasized that while AI can streamline access to health data, it also lacks the rigorous peer‑review safeguards that underpin official guidance from bodies such as the CDC and WHO. “When people rely on unvetted AI outputs, they may encounter the same echo chambers that fuel anti‑vaccine narratives online,” one expert said.
The poll also noted demographic trends: younger adults and those with higher levels of education were more likely to use AI chatbots for health queries, yet belief in vaccine myths persisted across age groups. KFF recommended that AI developers embed clearer citations, flag medical misinformation, and collaborate with public‑health agencies to ensure that chatbot responses align with evidence‑based guidance.
The findings arrive as the U.S. continues to grapple with pockets of vaccine resistance that have contributed to recent outbreaks of measles and whooping cough. Health officials have urged the public to verify AI‑generated medical advice against trusted sources and to consult qualified health professionals for personalized recommendations.
Analysis:
The correlation identified by KFF does not prove that AI chatbots cause misinformation, but it highlights a risk that the technology can amplify existing false beliefs when users accept AI output uncritically. The poll’s methodology—self‑reported usage frequency and belief statements—may be subject to response bias, and the sample size, while sizable, limits the ability to generalize to all U.S. adults. Nonetheless, the pattern aligns with broader concerns about algorithmic amplification of health misinformation.
Sources
– The Guardian, “Frequent AI chatbot users more likely to believe anti‑vaccine myths, poll finds,” June 30 2026, https://www.theguardian.com/technology/2026/jun/30/ai-chatbot-use-anti-vaccine-myths-poll
Story synopsis gathered from: The Guardian World — source
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Story synopsis gathered from: The Guardian World — source
