New COVID variant XBB.1.5 is on track to become dominant in the U.S., and experts are worried

New COVID variant XBB.1.5 is on track to become dominant in the U.S., and experts are worried

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Omicron strain XBB.1.5 is spreading so rapidly that the World Health Organization is scrambling to study its risks. The new subvariant is the most transmissible yet, Maria Van Kerkhove, technical lead for COVID-19 response at the World Health Organization, said at a Wednesday news conference. So…

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