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The Centers for Disease Control and Prevention’s official website temporarily published inaccurate information suggesting a link between vaccines and autism, according to federal officials who have since removed the erroneous content.
The false claim appeared in a section of the CDC website addressing concerns about thimerosal, a mercury-based preservative once commonly used in vaccines. The page incorrectly stated that thimerosal in vaccines might be associated with autism spectrum disorder.
“CDC is aware of incorrect information that was included on our website,” agency spokesperson Nick Spinelli confirmed in a statement. “As soon as we became aware, we removed this information and are actively addressing the issue internally.”
The misinformation, which directly contradicted decades of scientific evidence and the CDC’s own longstanding position, was discovered after it began circulating on social media platforms. Screenshots of the page were widely shared among anti-vaccination groups, who cited it as vindication for their concerns.
Medical experts expressed alarm at the error, emphasizing that the scientific consensus on vaccines and autism remains unchanged. Numerous large-scale studies have consistently found no connection between childhood vaccinations and autism development.
Dr. Leana Wen, former Baltimore health commissioner and public health professor at George Washington University, called the incident “deeply concerning” and noted its potential consequences.
“Misinformation like this can undermine public confidence in vaccines and public health guidance more broadly,” Wen said. “In our current environment, where trust in health institutions is already fragile, such errors can have serious ripple effects.”
The false claim appeared to have been on the CDC website for several days before being removed. Agency officials have launched an internal investigation to determine how the incorrect information was published and what safeguards failed in the content review process.
The incident comes at a particularly sensitive time for public health messaging. Childhood vaccination rates have declined in various parts of the country following disruptions during the COVID-19 pandemic. Public health departments have been working to counter a growing tide of vaccine hesitancy fueled partly by misinformation spreading on social media.
The CDC has been a primary target of criticism from anti-vaccine activists for years. This incident provides ammunition for those who question the agency’s reliability, experts warn.
“This is exactly the kind of error that feeds conspiracy theories,” said Dr. Peter Hotez, dean of the National School of Tropical Medicine at Baylor College of Medicine and a prominent advocate for vaccines. “It undermines decades of careful science and public health messaging.”
The false claim regarding thimerosal is particularly noteworthy given the compound’s history in vaccine debates. Thimerosal was removed from or reduced to trace amounts in all vaccines routinely recommended for children 6 years of age and younger in the early 2000s, with the exception of some inactivated influenza vaccines. This action was taken as a precautionary measure, not because evidence indicated harm.
Multiple subsequent studies, including a comprehensive 2004 review by the Institute of Medicine, found no evidence supporting a causal relationship between thimerosal-containing vaccines and autism.
Health communication experts emphasize that this incident underscores the challenges of maintaining accuracy in public health messaging across sprawling federal websites with thousands of pages.
“Government health agencies manage enormous amounts of content that must be regularly updated and verified,” said Sandra Quinn, professor and chair of the Department of Family Science at the University of Maryland. “But when it comes to vaccination information, there’s simply no room for error given the stakes involved.”
The CDC has pledged to implement additional review procedures to prevent similar incidents in the future. Meanwhile, public health advocates are working to counter the spread of the misinformation that resulted from the error.
“The scientific evidence remains crystal clear,” Spinelli added in the CDC statement. “Vaccines do not cause autism, and this unfortunate error does not change the agency’s position on vaccine safety.”
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8 Comments
The scientific consensus on vaccines and autism is clear, and I’m troubled to see the CDC publishing anything that contradicts this. They need to have ironclad processes in place to ensure the accuracy of all information on their website, particularly on such a critical public health issue.
I agree completely. The CDC must uphold the highest standards of accuracy and integrity, especially when it comes to vaccine safety. Anything less opens the door for misinformation to spread and undermine public health.
While it’s good the CDC quickly removed the misleading content, this incident highlights the need for rigorous fact-checking and quality control measures, especially on their website. Vaccine hesitancy is a real public health challenge, and the CDC must be a reliable, trustworthy source of information.
It’s troubling to see the CDC publishing content that contradicts the overwhelming scientific evidence on vaccines and autism. While I’m glad they removed the inaccurate information quickly, this incident highlights the need for the CDC to have extremely rigorous quality control processes in place, especially on their public-facing website.
Absolutely. The CDC must be a rock-solid, trustworthy source of health information. Allowing any misinformation, even briefly, can undermine public confidence and fuel dangerous anti-vaccine narratives. They need to take swift action to prevent such lapses in the future.
This is a concerning lapse from the CDC. Even a temporary posting of inaccurate information about vaccine safety can have serious consequences. I hope they conduct a thorough review to understand how this happened and implement robust measures to prevent it from occurring again.
This is concerning to see the CDC publishing inaccurate information, even if it was temporary. Maintaining public trust in authoritative health organizations is critical, especially on sensitive topics like vaccine safety. I hope the CDC conducts a thorough review to prevent such errors in the future.
Agreed, the CDC needs to be extremely careful and diligent when publishing information on vaccine safety. Even a brief lapse can be exploited by anti-vaccine groups and undermine confidence.