BioNTech recommends a third COVID-19 dose is needed to protect against the Delta variant. Need evidence to support this claim. Vast majority ending up in hospital/ICU are unvaccinated; evidence that to date, two doses of #vaccineswork.

Medical Mythbusting Commentary for August 11, 2021

Source:
BioNTech says repeat doses remain better strategy than adapting its COVID-19 vaccine to new variants