The World Health Organisation warned Wednesday that Donald Trump's bid to overhaul child vaccination in the United States went against 'decades of evidence'. President Trump signed an order on Monday pushing for a rethink of school vaccine mandates and repeating calls for the measles, mumps, and rubella (MMR) vaccine to be separated into three separate shots. But WHO director general Tedros Adhanom Ghebreyesus said the science is 'unequivocal: vaccines - including the MMR vaccine - are safe and do not cause autism.' 'Vaccination policy should be guided by rigorous, independent and transparent review of the best available science, not by political influence,' he warned in a post on X. US courts earlier this year suspended a shake-up of vaccination policy he had initiated.