The more transmissible BA.2.12.1 omicron subvariant became officially dominant in the U.S. last week, yet it already is being pushed out nationally by newcomers BA.4 and BA.5, both of which have arrived in Florida.
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The more transmissible BA.2.12.1 omicron subvariant became officially dominant in the U.S. last week, yet it already is being pushed out nationally by newcomers BA.4 and BA.5, both of which have arrived in Florida.