Two new homegrown variants of Covid-19 have been identified in the UK, both containing a mutation found on the Brazilian and South African strains.
One of the new variants, first identified in Bristol, has been designated a "variant of concern", by the New and Emerging Respiratory Virus Threats Advisory Group (NERVTAG).
The other, first identified in Liverpool, has been designated as a "variant under investigation" by the group.
Public Health England has a "high degree of confidence that the vaccines will work against variants", including the Bristol variant of concern.
Some 76 cases of the two new strains have been found so far in the UK.
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