Here's what you need to know about the omicron subvariant XBB.1.5.
A new flavor of the omicron variant was identified in October 2022 and in the past several weeks, it has steadily gained prominence in the United States. The subvariant is known as XBB.1.5 but has also been given the unofficial nickname"Kraken," after the mythical sea monster.Related: Most widely used COVID-19 vaccines and how they work
From their two parents, XBB viruses gained mutations that helped them evade protective antibodies gained through prior COVID-19 infections and through vaccinations. But there was a tradeoff: XBB viruses simultaneously lost some of their ability to bind tightly to cells, a key step in infection, the New York Times reported. This may explain why other versions of omicron initially outcompeted XBB viruses.
How easily does it spread?Available evidence suggests that XBB.1.5 is the"most transmissible" omicron descendent yet detected, Maria Van Kerkhove , the WHO's COVID-19 technical lead, said at a news conference on Jan. 4, according to The New York Times. In the U.S., XBB.1.5 is beginning to gain dominance over other circulating omicron subvariants.
That said, nationwide, other flavors of omicron — namely BQ.1 and BQ.1.1 — were still circulating at comparable levels to XBB.1.5 during the first week of January, the CDC's projections suggest.
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