Against delta, the early research showed 2 doses + boosters to be more effective than the original 2 dose series ever were. For instance, [0] shows them being 2

Against delta, the early research showed 2 doses + boosters to be more effective than the original 2 dose series ever were. For instance, [0] shows them being 20x more effective compared to the control group with two vaccine doses (which corresponds to something like 60x better than someone completely unvaccinated) [0]: https://www.cdc.gov/vaccines/acip/meetings/downloads/slides-2021-11-19/06-COVID-Oliver-508.pdf https://www.cdc.gov/vaccines/acip/meetings/downloads/slides-...