Quote Originally Posted by xsnaggle View Post
I get the % figure, I understand it, it is the remark about severe symptoms that puzzles. If it works then people don't get severe symptoms and if it doesn't they do. But if it works how can they tell that a paerson would have got mild or severe symptoms? That's all.
I don't think you get it.

100 people in the trial get covid. 5 are in the vaccine group, 95 are in the placebo group. So the vaccine is about 95% effective.

1-(5/95) =0.947

Repeat.for those with severe symptoms.