A Covid drug hailed as a game-changer may cause the virus to mutate, scientists warned today.

Molnupiravir is given to thousands of vulnerable Brits who test positive, such as patients fighting cancer or liver and kidney disease.

The antiviral, made by US pharma giant Merck, protects against severe illness by forcing mutations in the virus that fatally weaken it.

However, in some cases these mutations do not kill off the virus, say researchers at the Francis Crick Institute and UK Health Security Agency (UKHSA).

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