XBB.1.16—which a group of scientists on Twitter nicknamed “Arcturus”—is one of more than 600 Omicron subvariants that are currently circulating
. As we’ve seen with past variants, things can change quickly, Hotez says. Take XBB.1.5, which accounted for less than a quarter of COVID-19 cases in the U.S. going into late December last year. “Over the ensuing week, XBB.1.5 became the dominant variant,” says Hotez. Now that the newer variant is in the U.S., “the question is whether XBB.1.16 is going to do the same, or whether the two are [closely related] enough.
“Any new subvariant of Omicron, it’s not fazing us,” Gandhi says. “It doesn’t change [the WHO’s] baseline recommendation, which is to boost older and vulnerable people. There is a possibility that we get really unlucky and we get a worse variant, and then we would boost everyone, but the reason that we know this is not what XBB.1.16 is is that it’s causing the expected rise in cases without a high rise in hospitalizations.
On Apr. 18, the U.S. Food and Drug Administration released its latest vaccination guidelines, which cleared Americans ages 65 and older to receive a
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