They also tried 2 different dose regimens, one of which had 90% efficacy. The 70% figure is the weighted mean of the two I think.
1/5th the price, and no need for freezers. This vaccine is huge. I pray for more like this.
That makes no sense since there are no tested regimes with 70% effectiveness. The reporting should say there is a vaccine regime with 90% effectiveness, and add a footnote that another regime that will not be used had a far lower rate of effectiveness.