In one week, the prevalence of XBB.1.5 — an offshoot of omicron subvariant XBB — more than doubled in the U.S., according to the latest CDC estimates.
In one week, the prevalence of XBB.1.5 — an offshoot of omicron subvariant XBB — more than doubled in the U.S., according to the latest CDC estimates.
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