The mutation, a combination of the Indian and UK variants, is described by officials as 'very dangerous'.
The variant of Covid-19 first identified in India last October - called B.1.617.2 - is more transmissible than the UK/Kent variant - also known as B.1.1.7 - according to experts.
There is no evidence that any mutations of the coronavirus cause much more serious illness for the vast majority of people.
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