Please be aware that in these trials the placebo is not an inert known safe substance like water but rather another closely related vaccine. The goal is to ensu

Please be aware that in these trials the placebo is not an inert known safe substance like water but rather another closely related vaccine. The goal is to ensure that any reactions you get are similar to the primary vaccine. So, people experiencing side effects from placebos is not really proof that they're self-created or 'expected', just that whatever vaccine was used as the placebo could also cause side effects.