Mutations

The Omicron subvariants BA.4 and BA.5 have together become dominant in the U.S., the C.D.C. estimates

Continuing their rapid march across the United States, the Omicron subvariants known as BA.4 and BA.5 have together become dominant among new coronavirus cases, according to new estimates on Tuesday from the Centers for Disease Control and Prevention.

As of the week ending Saturday, BA.4 made up 15.7 percent of new cases, and BA.5 was 36.6 percent, accounting for about 52 percent of new cases in the United States, numbers that experts said should rise in the weeks to come.

Millions remain unboosted, as scientists say 3rd COVID shot provides 'significant' protection Older Americans — people over 50 — have proven to be more likely to receive their first COVID-19 booster. ABC News ABC News

... new federal data reveals a significant proportion of Americans have yet to receive their first and second boosters.

Covid Live Updates: F.D.A. Panel Recommends Updated Boosters That Target Forms of Omicron The move came as new federal estimates show two subvariants, known as BA.4 and BA.5, make up more than half of new U.S. cases in the country. But it is possible that the virus might evolve yet again by the fall. The New York Times

An expert committee recommended Tuesday that the Food and Drug Administration plan on an updated booster shot of the coronavirus vaccines that targets some form of the Omicron variant that has dominated for months.