A Covid strain spreading rapidly in the US is the ‘most transmissible subvariant that has been detected yet’, according to the World Health Organization.
But XBB.1.5 appears to be just as mild as its ancestor Omicron strains, with hotspots in Northeast America yet to record an uptick in hospital admissions.
The new subvariant – another spinoff of Omicron – is behind roughly 70 percent of new infections in the worst affected parts of the US and four in 10 nationally.
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