The COVID Omicron sub-variant BA.2, informally dubbed the "Stealth Omicron" variant, is able to reinfect people who have already had Omicron, a new study suggests. BA.2 has been under close ...

With the Omicron subtype BA.5 rapidly becoming dominant in the United States a small body of research has begun to reveal the unique properties of this novel SARS-CoV-2 variant. Two recent preprints ...

COPENHAGEN, Jan 31 (Reuters) - The BA.2 subvariant of the Omicron coronavirus variant, which has quickly taken over in Denmark, is more transmissible than the more common BA.1 and more able to infect ...

Just because you had an omicron variant of COVID-19 in the last few months doesn't mean you won't get infected with the newly dominant BA.5 subvariant, according to a new study of what's been called ...