The mystery virus: why we still aren't certain where Covid-19 came from

The idea that Covid-19 emerged from a lab in Wuhan was broadly dismissed as a conspiracy theory in the early stages of the pandemic. But experts have examined the possibility the virus escaped - accidentally or otherwise - from the Wuhan Institute of Virology. Now the head of the FBI says that's the "most likely" scenario. The scientific community is divided on the whether the virus has an animal origin or whether it was leaked, and reporting on the issue is confusing and often contradictory. So three years later, what can we say for certain? We ask UCD professor of virology, Dr Gerald Barry, to make sense of the claims and counter claims. Presented by Aideen Finnegan.

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