Philanthropist Melinda Gates reveals her proudest moments at the Gates Foundation

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"There are 3 million children alive today because of those vaccines and when we started in this work, there was you know a 20 or 25-year lag between when a vaccine would come out in the United States and when it would get to the developing world. Even when it got there, it wasn't all the right strains that they needed."

She added: "Even in this family planning work — we've only been at it since 2012 — but there are over 20 million women who voluntarily have gotten family planning access, who wouldn't have had it otherwise."