Some 2005 claims by an anti-vax group that Hepatitis B vaccines among with some other vaccines in combination would raise autism by 1135%.
Problem for that claim is thimerosal hasn’t been used in child vaccines for many years.
https://www.fda.gov/vaccines-blood-biologics/safety-availability-biologics/thimerosal-and-vaccines#nolinkEdited by TigerMatt at 16:54:19 on 06/30/25