They used to put thimerosal in a bunch more vaccines. Until the clamour of anti-vaxxers who insisted that the rise in childhood autism cases was a direct cause

They used to put thimerosal in a bunch more vaccines. Until the clamour of anti-vaxxers who insisted that the rise in childhood autism cases was a direct cause of it (despite no evidence to back the claim) got so loud that they stopped using it in childhood vaccines in 2001. And childhood autism rates continued to rise unaffected by the change, proving (again) that this was due to some other factor (more sensitive diagnosis being the most popular theory) and also that the anti-vaxxers were full of shit and had no idea what they were talking about.