Leadership is about vision and responsibility, not power.

Measles is probably the best argument for why there needs to be global health, and why we have to think about it as a global public good. Because in a sense, measles is the canary in the coal mine for immunization. It is, you know, highly transmissible. The vaccine costs 15 cents, so it's not - you know, shouldn't be an issue in terms of cost.

Whether a man is burdened by power or enjoys power; whether he is trapped by responsibility or made free by it; whether he is moved by other people and outer forces or moves them -- this is of the essence of leadership.

For just a few dollars a dose, vaccines save lives and help reduce poverty. Unlike medical treatment, they provide a lifetime of protection from deadly and debilitating disease. They are safe and effective. They cut healthcare and treatment costs, reduce the number of hospital visits, and ensure healthier children, families and communities.

You can't stop wars to build tertiary teaching hospitals, but you can say, 'Let's stop for a couple of days to immunise the kids.' It has been done.

I love science, and I believe in it. I have a faith that science can solve problems and make the world a better place.