Why the China Covid lab-leak theory is being taken seriously - BBC News

Nearly a year and a half since Covid-19 was detected in the Chinese city of Wuhan, the question of how the virus first emerged remains a mystery.

But in recent weeks the controversial claim that the pandemic might have leaked from a Chinese laboratory - once dismissed by many as a fringe conspiracy theory - has been gaining traction.

Now, US President Joe Biden has announced an urgent investigation that will look into the theory as a possible origin of the disease.

China's foreign ministry accused the US of "political manipulation and blame shifting", rejecting any link between Covid-19 and a virus research lab in the Chinese city of Wuhan.

Ros Atkins explores what the US investigations are covering.

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