It only took about a month for BA.2.12.1, an Omicron subvariant, to cause most of the new COVID-19 cases in the U.S. since scientists first spotted it in the country. But even newer iterations of the ...

Panel A shows the lineage of mutations that have been identified in the omicron BA.1, BA.2, BA.2.12.1, and BA.4 or BA.5 subvariants of SARS-CoV-2, as compared with the reference WA1/2020 isolate. BA.4 ...

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 ...

A new version of omicron is dominant in the U.S. The coronavirus subvariant known as BA.5 accounted for nearly 54% of the country's Covid cases as of Saturday, according to the Centers for Disease ...

June 28 (Reuters) - Pfizer Inc (PFE.N), opens new tab and Moderna Inc (MRNA.O), opens new tab said on Tuesday they will be ready with COVID-19 vaccines designed to combat the BA.1 Omicron variant that ...