Moderna is launching a trial of a new Covid-19 vaccine as the US biotech group warned that its current shot was less effective in tackling the strain that emerged in South Africa.
Laboratory tests show Moderna’s Covid-19 jab still works against the variant named 501.V2, which emerged in South Africa, and B.1.1.7, which was first discovered in the UK, the company said.
But it warned that the neutralising antibody response to 501.V2 was sixfold lower than to the original variant, raising concerns that immunity to it may wane significantly, particularly in older people.
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