3 ms·
Don't you need a control group for stage 3 (no vaccine)? If so, that might be highly problematic/unethical.
by jononor 6y ago
Don't you need a control group for stage 3 (no vaccine)? If so, that might be highly problematic/unethical.
- sfblah 6y agoNo, 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.