Wuhan

  1. Origins: Hunting the Source of Covid-19

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    Video caption: It remains one of the world's biggest mysteries: what triggered the Covid-19 pandemic?

    It remains one of the world's biggest mysteries: what triggered the Covid-19 pandemic? The BBC's global health correspondent Tulip Mazumdar delves into the main theories.

  2. Covid origins: The science

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    Video caption: What the science says about the start of the pandemic

    While politicians suspect the Wuhan Institute of Virology of having a role in starting the pandemic, most scientists think it came from the wild. Roland Pease investigates.

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    Video caption: Trump supporters on Wuhan lab leak theory

    Supporters of former US president Donald Trump gathered near Cleveland, Ohio, on Saturday to hear him speak.

  4. Dr Tom Frieden on Covid origins and the Wuhan lab-leak theory

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    Video caption: Dr Tom Frieden on Covid origins and the Wuhan lab-leak theory
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    Video caption: Covid infecting humans through animal host 'probable'

    Professor John Watson is a member of the World Health Organization's team investigating the origins of Covid-19.