Quote Originally Posted by the other bob wilson View Post
https://www.bbc.co.uk/news/health-55040635

Interesting line about how the effectiveness rose to 80 per cent in people given an initial half dose and then a full dose.

From what I understand, this is a field where 50 per cent effectiveness is considered good, so I'm not sure I buy that bit about 70 per cent being a "disappointment" and I don't get how thirty cases of Covid among those who were given the vaccine and 101 in those given a dummy works out at 70 per cent protection when 20,000 people were involved in the testing.
The maths do make sense. 101 of 10,000 got Covid when given a placebo. In those given the vaccine only 30 got it, which is 70% less than the placebo group, so it's 70% effective.
Interesting point about the group given a half dose first. No doubt this will be investigated further.