The Oxford / AstraZenica one has released interim results. 70% overall effectiveness, but that's trying two different delivery methods. Two full doses gives 60% protection whilst 1.5 gives 90%. My immunology isn't good enough to get why that happens but clearly someone thought it might be the case for it to be included in the trial.
Which means that the 300 million doses ordered would treat 200 million people.
It's also a more conventional Vaccine which is easier to distribute and store. They're doing it at minimal cost to the third world so it's very good news for humanity as a whole and good news for us.
https://www.astrazeneca.com/media-centre/press-releases/2020/azd1222hlr.html
Which means that the 300 million doses ordered would treat 200 million people.
It's also a more conventional Vaccine which is easier to distribute and store. They're doing it at minimal cost to the third world so it's very good news for humanity as a whole and good news for us.
https://www.astrazeneca.com/media-centre/press-releases/2020/azd1222hlr.html