The WHO does not have any data yet on the severity of XBB.1.5 but there's no indication it makes people more sick than previous subvariants, Van Kerkhove said.
The XBB.1.5 omicron subvariant that's currently dominating the U.S. is the most contagious version of Covid-19 yet, but it doesn't appear to make people more sick, according to the World Health Organization.
It has been detected in 29 countries so far but it could be even more widespread, Van Kerkhove said. Tracking Covid variants has become difficult as genomic sequencing declines across the world, she said. Scientists say XBB.1.5 is about as good at dodging antibodies from vaccines and infection as its XBB and XBB.1 relatives, which were two of the most immune evasive subvariants yet. But XBB.1.5 has a mutation thatAs XBB.1.5 rapidly spreads in the U.S., China is battling a surge of cases and hospitalizations after abandoning its zero-Covid policy in response to social unrest late last year. U.S.
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