3 ms·
Last year Delta didn't exist. If you want to see efficacy of vaccination, compare incidence among vaccinated and non-vaccinated (which will be about 4x).
by ant6n 5y ago
Last year Delta didn't exist. If you want to see efficacy of vaccination, compare incidence among vaccinated and non-vaccinated (which will be about 4x).
- graeme 5y agoYeah but my point is that people point to relative efficacy when it is absolute reduction which matters. Delta being 2x worse means you need a stronger relative protection. What do you mean by 4x: relative severe disease protection? That would be 75% efficacy, a marked drop from 95% efficacy (20x protection). I think most of the west still has higher severe disease efficacy than that, though Israel fell as low as 80% pre booster.