The WHO said omicron XBB.1.5 does not have any mutations known to make people sicker, but added that it needs more data to draw conclusions about its severity.
The WHO said the omicron XBB.1.5 variant does not have any mutations known to make people sicker, but added that it needs more real-world data to draw conclusions about its severity.The global health agency said the subvariant could cause cases to rise globally, though it needs more data form countries other than the U.S.
The WHO said XBB.1.5 is one of the Covid subvariants that is most adept at dodging immunity from vaccination or infection. It is just as immune evasive as another subvariant in its family, XBB.1., which was the Covid variant that best dodged antibodies that block infections. . Scientists believe it has a growth advantage because it is highly immune evasive and binds more tightly to human cells, making it more infectious.
In the U.S., XBB.1.5 is the only subvariant showing substantial growth right now. It rose from about 2% of cases in early to December nearly 28% in the first week of January, according to data from the Centers for Diesase Control and Prevention. It is causing more than 70% of new Covid cases in the Northeast.
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