 Is there a case for really targeting particular countries where a new variant emerges or where there's a risk of a new variant spreading? I would not wish, I think, to target particular parts of the world or particular communities. It's crucial that we push forward with reducing the amount of virus everywhere. There are certain communities, senior people, people with other illnesses, who are more vulnerable to getting severe illness and needing hospital and tragically dying. And it's very important that we protect those that are at greatest risk of ill health wherever they are in the world. I would much rather we vaccinated those communities everywhere in the world. The most vulnerable and healthcare workers, maybe 30%, 40% of every population first, rather than 100% of some populations. Because by doing that, we'll reduce the burden on the health systems. We'll protect healthcare workers so that they can look after us when we have malaria or whether we have a heart attack or whether we're in childbirth or whatever. We need healthcare workers everywhere and we must protect them as a priority. So I would rather vaccinate some people in every country than all people in some countries. And I think that's the best way out of the pandemic.