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A team of top scientists ask where Covid came from. But can they trust data from China? As the new virus takes hold in Wuhan, the Chinese state downplays its infectiousness and punishes a doctor who sounded the alarm. It raises the question of trust in what China and its scientists say - a question soon at the heart of a brewing political storm over Covid’s origin. Western scientists offer a response to claims the virus could’ve leaked from a lab. But are they being given the full picture? Archive: CBS; The White House; NPR; Weibo; CGTN; Tom Cotton; CBS; MSNBC; Democracy Now!; CNN. 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 Â鶹Éç 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 Â鶹Éç News - Long Form Audio: Emma Rippon