The fast-spreading BA.5 subvariant of Omicron and its close relative BA.4 now make up around 95% of COVID-19 cases in the U.S., according to estimates published Tuesday by the Centers for Disease ...

Therefore, we collected serum samples from participants who had received three doses of either of the original monovalent mRNA vaccines followed by one dose of a bivalent vaccine targeting BA.4–BA.5 ...

BA.5 is still classified as an omicron variant but has new mutations different from BA.1 and BA.2 The first cases appeared in the Northeast, then started spreading to the South, Midwest and West Can ...

As the United States enters the thick of respiratory virus season, a highly mutated COVID-19 variant called BA.2.86 is spreading and causing an increasing proportion of cases across the country.

Like a Hollywood franchise that churns out sequel after mind-numbing sequel, Omicron is back. Mere weeks after the variant’s BA.2 lineage caused surges globally, two more Omicron spin-offs are on the ...