Jan. 3, 2023 -- A new subvariant of Omicron is responsible for a surge in domestic COVID-19 cases, according to the Centers for Disease Control and Prevention. Called XBB, it accounted for 3.6% of total cases in the United States during the last week ...
source https://www.webmd.com/covid/news/20230103/new-omicron-subvariant-surging-in-u-s
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