The modern American anti-vaccine movement combines several different constituencies. His appointment as HHS secretary moved a figure long associated with the anti-vaccine movement into the country’s highest public-health institution. There is also a large network of activists, parent groups, alternative-health advocates, online personalities and organizations that campaign against vaccine mandates or question vaccine safety. MMR vaccineThe MMR vaccine became the central target of the anti-vaccine movement because of the claim that it causes autism. The political divide is becoming less predictableThe American anti-vaccine movement no longer fits neatly into the traditional left-right political structure.