XBB.1.5 has been dominant in the Northeast for several weeks and is now dominant in the U.S. as a whole.
The XBB.1.5 omicron subvariant that has been dominant in the Northeast for several weeks is now officially dominant across the U.S., according to an update from the Centers for Disease Control and Prevention early Friday.
Last week, BQ.1.1 was still dominant nationwide, accounting for 33.5% of new cases versus XBB.1.5’s 30.4%. XBB.1.5 is similar to its immediate predecessor XBB.1 but has an additional mutation to its spike protein that may be behind its growth advantage. For now, it does not appear to have any mutation that might lead to more severe disease or death, WHO officials have said. The agency is monitoring it along with five other omicron variants.
For asymptomatic patients who test positive, the WHO now recommends five days of isolation, compared with 10 days previously.
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