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The Pfizer/BioNTech vaccine can still target a key mutation that has emerged in two new variants of coronavirus, laboratory studies show.
However, this is only one of many mutations that are found in the new forms of the virus.
So while the study has been welcomed, it is not being seen as definitive scientific evidence about how the vaccine will perform.
New variants have been detected in the UK and South Africa.
Both forms of the virus are spreading more quickly and this has raised questions over what level of protection vaccines can offer against