There were only 101 people that caught COVID out of 12,000 in the placebo group. They were really struggling to find sick people to complete the trial so has to change countries to Brazil. 1 person died in the placebo group although it’s not clear what killed the person or whether it was a reaction to the vaccine used in the placebo. So 30 caught COVID in the 12,000 vaccine group and 131 caught it in the 12,000 placebo group. That’s where they get their 70% effectiveness from.
more transparency required. What the trial did suggest was that there was hardly any covid around, even in Brazil.