What is Simpsonwood?
A 2000 CDC meeting sparked long-running rumors about vaccine safety. We explain what really happened at Simpsonwood and what science says today.
We debunk the latest vaccine misinformation each week in our Just the Facts: Correcting this week’s disinformation newsletter. Browse the other Just the Facts Newsletter Topics by clicking the link below:
A 2000 CDC meeting sparked long-running rumors about vaccine safety. We explain what really happened at Simpsonwood and what science says today.
Sanitation helped, but vaccines stopped deadly diseases like measles, polio, and smallpox from spreading. The data shows what made the real difference.
Are even one or two vaccines unsafe? This post looks at the science on SIDS, brain development, autism and why spacing out shots doesn’t make them safer.
Do more childhood vaccines mean more autism? This post breaks down the claim and explains why decades of research show the schedule does not cause autism.
CDC changes raised new autism-vaccine fears, but science is clear: vaccines don’t cause autism. Learn how real research works and what the evidence shows.
A new report revives the myth that vaccines cause autism, but decades of large studies show no link. Learn why genetics, not immunizations, drive autism risk.
A retracted study used in Vaxxed falsely claimed vaccines cause autism. Experts explain why the data was misused and why the science doesn’t support it.
Thimerosal, a mercury-based preservative once used in vaccines, contains ethylmercury—not the harmful kind found in fish. Studies show it’s safe, doesn’t cause autism, and hasn’t been in childhood vaccines since 2001.
Despite new claims from RFK Jr. and Trump, vaccines do not cause autism. We unpack the history and the science showing no link, just political noise and old debunked theories.
A secret study claiming vaccines cause autism can’t be trusted if no one can review the data. Here’s what real, published science tells us about vaccines and autism.