Regarding the one dose strategy which has been questioned...
The CEO of AZ again...
I think the UK one-dose strategy is absolutely the right way to go, at least for our vaccine. I cannot comment about the Pfizer vaccine, whose studies are for a three-week interval. In our case, the trial we're talking about was conducted by Oxford University. We AZ are conducting the US trial, which we think is going to be ready very soon. Oxford University conducted the so-called Oxford trial in UK and Brazil, and we have data for patients who received the vaccine in one-month interval, 2 or 3 months interval. First of all, we believe that the efficacy of one dose is sufficient: 100 percent protection against severe disease and hospitalisation, and 71-73 percent of efficacy overall. The second dose is needed for long term protection. But you get a better efficiency if you get the 2nd dose later than earlier. We are going to do a study in the US and globally to use two-month dose interval to confirm that this is indeed the case, there are many reasons to believe it is the case with our vaccine.
We have a different technology. First of all, when you look at level of antibody production, this is higher if you give the second dose three months or two months later than one month later. Also, if you look at Ebola, its vaccine, which is also using the Adenoviral vector like the Covid one, the second dose needs to be given eight weeks later. Finally, the J&J vaccine with Adenoviral vector also are performing studies on a two-month interval. And J&J has the same technology as ours. Therefore, for our vaccine, there is no doubt in my mind that the way the UK is going is the best way, because right now you have a limited amount of vaccine, but also you have a limited number of doctors and nurses able to inject people. So you maximize the number of people who get one dose. You give them enough protection for two or three months, then you give them the second dose after 3 months. By March, the UK will have vaccinated maybe 28 or 30 million people. The Prime Minister has a goal to vaccinate 15 million people by mid-February, and they're already at 6,5 million. So they will get there".