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Mutations to a virus are common in the course of a pandemic. Scientists believe one called D614G may have made it easier for the virus to be transmitted between humans. As cases of people becoming reinfected with Covid-19 start to be seen, there are concerns that this might be a result of new variants. Could we be hearing more about other mutations in the future?

Voice: Marnie Chesterton
Production: Jack Burgess, Katherine Campbell, Anna Doble
Graphics: We Are Covert
With thanks to: Dr Oscar Maclean, University of Glasgow

This content was created with funding from Wellcome.