What experts know about COVID-19 omicron subvariant BA.2
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5 April 2022What experts know about COVID-19 omicron subvariant BA.2
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 case in the U.S. was on Dec. 1, 2021. Since then, the Centers for Disease Control and Prevention (CDC) has classified two subvariants, BA.1.1 and BA.2.
