The XBB family of Omicron has landed in the U.S. Here’s what it means for this fall’s COVID wave

Here’s what we know about the latest omicron variant’s emergence in the United States:

“XBB—a new, extremely immune-evasive Omicron variant surging in Singapore—hasn’t yet been detected in the U.S. But its child has.

XBB.1 was first detected in the U.S. on Sept. 15 and made up 0.26% of cases that were genetically sequenced over the past 15 days, Raj Rajnarayanan, assistant dean of research and associate professor at the New York Institute of Technology campus in Jonesboro, Ark., told Fortune. He cited data from GISAID, an international research organization that tracks changes in COVID and the flu virus.”

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