Don't you need a control group for stage 3 (no vaccine)? If so, that might be hi... | Hacker News

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		jononor on Dec 18, 2020 \| parent \| context \| favorite \| on: It took two days to develop Moderna’s vaccine Don't you need a control group for stage 3 (no vaccine)? If so, that might be highly problematic/unethical.

sfblah on Dec 18, 2020 [–]

No, you don't, because you're infecting them on purpose. It's safe to assume that an extraordinarily high percentage of them would be infected if they were on a placebo leg of the trial.

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