A new Covid variant that is feared to be the 'most vaccine-resistant yet' has sent case numbers soaring in — and it is already in the US.The mutant strain — dubbed XBB — is another spin-off of the variant and has been blamed for Singapore's infection numbers doubling in the past fortnight.It has accumulated mutations in its receptor binding domain, a key part of the spike protein where virus-fighting antibodies dock and block infections.
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