Every day there's another country. It's going to go all the way across, there's no doubt about it.

The ultimate expense for any given country naturally would be considerably less than if you had to have a regimen in which you gave the drug every day,

With seasonal flu, the response rate in healthy young adults ranges from 60 to 90 percent. We all hoped for 70 percent with this vaccine, but it wasn't to be. The next step is to give a booster to those who failed to respond, which we're already doing. Earlier studies have shown a third shot often increases immunity dramatically.

Not to prepare for the worst-case scenario would be completely irresponsible.

We're aiming at 20-million doses of a pre-pandemic vaccine but to develop the capacity to be able to make 300-million doses within six months of when we ultimately get the latest version of it that is the real killer.

As we build up our capacity to respond to seasonal influenza, it will put us in good stead.