Omicron sub-variants BA.4, BA.5 make up 70% of COVID variants in U.S. - CDC

The fast-spreading BA.4 and BA.5 sub-lineages of Omicron are estimated to make up a combined 70.1% of the coronavirus variants in the United States as of July 2, the U.S. Centers for Disease Control and Prevention said on Tuesday. BA.4 and BA.5 made up 52% of U.S. variants for the week of June 25. They were added to the World Health Organization's monitoring list in March and designated as variants of concern by the European Centre for Disease Prevention and Control.