Wait, what? No. Just no. To confirm efficacy they gave the vaccine to half of a population likely to develop the disease naturally. Then they compared how many

Wait, what? No. Just no. To confirm efficacy they gave the vaccine to half of a population likely to develop the disease naturally. Then they compared how many people for sick in each group. That's why testing took a year instead of 2 months, they have to wait for enrollees to get sick naturally. If we ignore ethics, I guess we could get more nuanced efficacy information out of a small sacrificial population. But that is just not done. Not even during a pandemic.