On Monday President Trump and the U.S. Health Secretary Robert F. Kennedy Jr. held a press conference in which they made extraordinary new claims about autism. They suggested a potential link between the use of Tylenol during pregnancy and the development of autism. They also advocated spacing out childhood vaccinations. The two men's interest in the link between vaccines and autism goes back decades but these claims did not originate in the US. They trace back to the UK in 1998, when disgraced former doctor Andrew Wakefield first published his now-debunked theory linking MMR vaccines to autism cases in children. Today on the Global Story science journalist Adam Rutherford explains how the Wakefield vaccine conspiracy became the biggest medical disinformation disaster in recent history, and how these ideas found fertile ground in the Trump administration. Every weekday, this is The Global Story. The world is changing. Decisions made in the US and by the second Trump administration are accelerating that change. But they are also a symptom of it. With Asma Khalid in DC, Tristan Redman in London, and the backing of the BBC’s international newsroom, The Global Story brings clarity to politics, business and foreign policy in a time of connection and disruption. For more episodes, just search 'The Global Story' wherever you get your BBC Podcasts.

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