A number of studies are converging on the fact that 2 doses of vaccination has poor vaccine effectiveness against Omicron. 3 doses does slightly better, but the effect will rapidly wane as antibody titers fall, and infection is certain as the number of exposures increase.
These studies have immediate implications for vaccine and health-care policies.
First, Kaiser Southern California. Here are data for 2 doses of mRNA for effectiveness against Omicron. Follow the red line. Over time, it is 0%.
3 doses does better, for now. But look at the confidence interval of the red line. We have no idea if it will be preserved.