UK Report on SARS-CoV-2 variants of concern finds significantly lower vaccine effectiveness (VE) against Omicron infection, but a moderate to high VE of 70 to 75% is seen after a third (booster) dose.

Report: SARS-CoV-2 variants of concern and variants under investigation in England – UK Health Security Agency

Commentaries:

Omicron: Three vaccine doses key for protection against variant – BBC

Two jabs offer little protection against Omicron infection, UK data shows – The Guardian

UK Says Omicron to Become Its Dominant Variant Within Days – Associated Press