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A hybrid version of the coronavirus has surfaced in California after the British Kent variant and a strain found in the US merged together inside an infected person.
The variant, not yet named, has only been spotted once but scientists fear there are likely to be more cases.
Experts are worried because it carries mutations which appear to make it able to spread faster and also to slip past some of the immunity made from past infections or vaccines.
It was formed from the Kent Covid variant – known scientifically as B.1.1.7 – and a Californian variant called B.1.429.
Scientists in the US claim they merged in a recombination event , the New Scientist reports. This happens when two different versions of the virus infect the same cell and then swap genes while they are reproducing, giving rise to a new variant.