With few clear answers, speculation has persisted since the beginning of the pandemic, spawning misinformation and conspiracy theories as well as sharp diplomatic tensions.
Another idea floated early on was that the virus did not reach people through animals but was engineered. The WHO team that travelled to Wuhan in January said in their report that animal transmission was "likely to very likely" while a lab leak was "extremely unlikely". "We must take hypotheses about both natural and laboratory spillovers seriously until we have sufficient data," they wrote.
Days later US President Joe Biden gave intelligence agencies three months to report to him on whether the Covid-19 virus first emerged in China from an animal source or from a laboratory accident. Tensions between the US and China were already high in the spring of 2020 when Trump raised the lab-leak theory -- a charge Beijing answered with its own hypothesis that the virus came from an American lab.
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