> It wouldn't really be ethical to do so with an unproven vaccine (and it was proven, this trial wouldn't be necessary). That is a thing that people do sometim

> It wouldn't really be ethical to do so with an unproven vaccine (and it was proven, this trial wouldn't be necessary). That is a thing that people do sometimes: https://en.wikipedia.org/wiki/Human_challenge_study https://en.wikipedia.org/wiki/Human_challenge_study There has been a debate about also doing it with COVID-19: https://en.wikipedia.org/wiki/COVID-19_vaccine#Proposed_challenge_studies https://en.wikipedia.org/wiki/COVID-19_vaccine#Proposed_chal...