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 ...

On the heels of concerning new lab and animal experiments suggesting that BA.2 may be capable of causing more severe disease than the original Omicron strain, two new studies are helping to show how ...

Recent studies of the BA.2 sub-variant of Omicron suggest that it is both more transmissible and more lethal than Omicron BA.1, and that it is quickly supplanting the previous variant in country after ...

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 ...

A recent study posted to the bioRxiv* preprint server demonstrated that the latest severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron sublineages evade immunity imparted by the prior ...

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 ...

In a recent study posted to the bioRxiv* preprint server, researchers investigated the waning of protective immunity conferred by prior infection by Omicron sub-variants BA.1, BA.2 towards its most ...