https://fit.thequint.com/coronavirus/vaccine-treatment/omicron-variant-covid-vaccine-efficacy-pfizer-astrazeneca-boosters#read-more
In the case of those who were vaccinated with the Pfizer vaccine, the vaccine's protection against symptomatic infection dropped to between 34 -37 percent 15 weeks after the second dose—significantly lower than its performance against the Delta variant.
On the other hand, those who received 2 doses of AstraZeneca, showed an even heaver loss of vaccine protection against symptomatic disease from Omicron at the same 15 week mark.
