The omicron subvariant BA.2, also known as "stealth" omicron, has steadily grown more common in the U.S. since it was first detected in the country in January, but that doesn't mean it will trigger a ...

More than two-thirds of cases of the Omicron variant of COVID-19 are among people who have been reinfected with the virus, a new study said Wednesday. Imperial College London researchers reported that ...

Cases of the BA.2 omicron subvariant, known as "stealth omicron," first detected in Michigan in mid-January, are starting to add up in Metro Detroit and Washtenaw County. Ninety-nine cases have been ...

The World Health Organization has released a new report on Omicron sub-variant BA.2 which shows the strain accounted for 21.5% of all new Omicron cases analyzed worldwide in the first week of February ...

Cases in New York City rose sharply -- but they may be dropping sharply, too. New York City's surge of COVID-19 cases fueled by the omicron variant appears to be falling just as quickly as it rose.