The coronavirus pandemic has raised so many questions as it has continued its inexorable spread across the planet, but perhaps the first of them remains the most contentious: where did Sars-CoV-2 come from?
In recent weeks there has been renewed focus on whether it could have escaped from a Chinese laboratory. However, new findings strengthen the case for a natural origin, in what has become a heavily politicised debate.
The resurgence of the lab leak theory – promulgated early last year by Donald Trump and his supporters, before being dismissed – has been fuelled by the publication of emails in which Joe Biden’s chief medical adviser, Dr Anthony Fauci, discussed it,
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