XBB.1.5, which makes up 28% of new COVID cases in the U.S., fuels worries about a winter wave

XBB.1.5, which makes up 28% of new COVID cases in the U.S., fuels worries about a winter wave

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The COVID-19 variant XBB.1.5, a highly transmissible subvariant of omicron, has rapidly become one of the most dominant strains of the virus in the U.S. In the first week of January, XBB.1.5 made up an estimated 27.6% of new COVID-19 cases in the U.S., according to data from the Centers for…

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