Health authorities and scientists say they are now racing to study BA.2.86, a new strain of the virus that causes COVID-19, after the highly mutated variant was spotted spreading in multiple countries ...

In the cohort that received the BA.5-containing bivalent booster, the neutralizing activity against all the omicron subvariants as compared with that against WA1/2020 was better than in the other two ...

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 ...

Strain found in 29 states and Puerto Rico carries spike mutations, but no data shows increased severity Sign up for the Breaking News US email to get newsletter alerts in your inbox BA.3.2, an Omicron ...