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What experts know about COVID-19 omicron subvariant BA.2
ROCHESTER, Minn. — The World Health Organization designated COVID-19 variant B.1.1.529, named omicron, a "variant of concern" on Nov. 26, 2021, and the first confirmed…

December 17, 2021
Mayo Clinic Q and A: Vaccines and boosters for COVID-19 omicron strain
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