How new evidence suggests Covid-19 jumped from animals to humans multiple times

Preliminary findings indicate virus was spread between different species via ‘natural spillover’ events

Bat hanging from tree
(Image credit: Ina Fassbender/AFP via Getty Images)

Infectious diseases expert Hamish McCallum of Griffith University in Queensland on how lab leak theories are undermined by newly published research data

The origin of the Sars-CoV-2 virus, which has caused the Covid-19 pandemic, has been hotly debated.

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