40 times less effective, against Omicron which is 10 times better at immune escape that the previous record holder which was the beta variant.. Meanwhile the initial studies suggest that people naturally previously infected by covid have a MUCH better immune response against Omicron, which is also in itself a MUCH more mild disease than the other variants of covid such as Delta.
And yet the western governments still pedal the vaccines like they are the best thing since sliced bread.
h/t Agent Smith 2014