Fever: The Hunt for Covid's Origin

3. Uncertainty and Trump

US President Donald Trump wades into the Covid origins debate.It’s April 2020 and at the podium of the White House’s press room, Donald Trump makes a geopolitically incendiary claim: he has a high degree of confidence that the origin of the virus that causes Covid is the Wuhan Institute of Virology - a Chinese government lab. But scientists seem certain that can’t be true. So what is the evidence for both claims? And what were the scientists publicly dismissing a lab leak saying in private?Archive: The White House; C-SPAN; CBS.Presenter: John Sudworth
Series producer: Simon Maybin
Editor: Richard Vadon
Sound design and mix: James Beard
Commissioning editor: Dan Clarke
Science advice: Julian Siddle and Victoria Gill
Extra production: Eva Artesona and Kathy Long
Research support: Zisheng Xu and BBC Monitoring
Production coordinators: Siobhan Reed, Helena Warwick-Cross, Sophie Hill, and Debbie Richford
Theme and original music: Pete Cunningham, with trumpet by Joss Murray
Radio 4 Editor of Editorial Standards: Roger Mahony
Head of BBC News - Long Form Audio: Emma Rippon

Cover-ups, coincidences, and conspiracy theories: where did Covid come from?
 
John Sudworth was the BBC's China correspondent when an unexplained pneumonia started worrying Wuhan doctors in December 2019. Since then, he's been investigating the origin of the virus that would turn into a devastating global pandemic.
 
From the beginning, there have been claims of certainty. Many scientists say the virus that causes Covid came from nature - probably carried from bats to other animals, and then to humans in a Wuhan market. 
 
But an alternative possibility - that it leaked from a laboratory - has refused to go away. And other scientists claim there's uncertainty. For them, the mystery of Covid's origin remains unsolved.
 
So, where did Covid come from? For every one of the millions of lives lost, for every long sufferer, for the pain, the isolation, and the incalculable economic cost, the answer matters. It might also help us prevent another - maybe even worse - pandemic.
 
But it's a debate that's become politicised, toxic, and a bit crazy.
 
Presenter: John Sudworth
Series Producer: Simon Maybin
Editor: Richard Vadon
Commissioning Editor: Dan Clarke