The BA.2 sub-variant of Omicron and its sublineage BA.2.12.1 is estimated to make up more than 90 percent of the coronavirus variants in the United States as of April 16, the U.S. Centers for Disease Control and Prevention (CDC) said on April 19.

The Centers for Disease Control and Prevention administered 4,563,260 first doses of Covid-19 vaccines in the United States as of the morning of Jan. 4 and distributed 15,418,500 doses.