Could I add a point there? I think you have to remember we're not making Aspirin or Coca-Cola, or something, when you're making vaccine. When you make a vaccine, there are biologics that are very difficult to make. You can have policy based on the best science that's available, but then biology often confounds issues.
Let's take the issue of supply--and this is where I was going to comment here. I'm sure you're all aware that the U.S. is now having difficulty with the supply of vaccines, although I think they have four or five manufacturers supplying. I think with all the best will in the world, the manufacturers predicted that they would be supplying 130 million doses to the U.S., or whatever. But the reality was....
Let me put it this way. We think we're dealing with a flu virus, as if it's sort of the same thing, you know. They change slightly every year. Somebody mentioned earlier on that there are very subtle changes in these viruses, and how they behave is very different. This particular virus, it turns out, grows very, very poorly. That wasn't predicted when they started to make these vaccines, and that really has caused a huge problem with the supply.
So I think you have to balance the best science you have to make the policy, but on top of that, you have to bear in mind that we're dealing with biology here as well.