The emergence of more infectious variants of Sars-CoV-2 has raised questions about just how long our vaccines will remain effective for. Although there is little evidence that the current vaccines won’t work against the new variants, as the virus continues to mutate scientists are preparing themselves for having to make changes to the vaccines in response. Speaking to Dr Katrina Pollock, science correspondent Linda Geddes asks how we can tweak the vaccines against new variants, and how likely it is we’ll end up in a game of cat and mouse with the virus



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