Quote from the WHO article linked in the word "unrthical":
> No scientific necessity for a no‑treatment arm: Placebo or no‑treatment vaccine trials are only acceptable when no proven intervention exists or when such a design is indispensable to answer a critical question of efficacy or safety. Neither condition appears to be met based on publicly available descriptions of the study.
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[ 192 ms ] story [ 2697 ms ] thread> No scientific necessity for a no‑treatment arm: Placebo or no‑treatment vaccine trials are only acceptable when no proven intervention exists or when such a design is indispensable to answer a critical question of efficacy or safety. Neither condition appears to be met based on publicly available descriptions of the study.