I often hear people say that the world has become smaller, referring to our ability to travel with relative ease between countries and continents. But in fact, the world is getting bigger every day.

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The Bill & Melinda Gates Foundation and the U.S. Department of Defense mostly operate with very different roles and objectives. But there’s one important thing they have in common: a shared commitment to finding vaccines for infectious diseases like HIV and malaria.

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Travelling around Madagascar with a group of journalists and UNICEF colleagues, I’m struck by how many people are receiving the pentavalent vaccine and the lengths they are going to get it.

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As we begin another year in the battle against polio, I am optimistic that eliminating this disease from the face of the planet is within our reach. Over the last 30 years, global health efforts have pushed polio to the brink, reducing its prevalence by 99 percent. Thanks to these efforts, the disease remains endemic in only a handful of countries, yet steep challenges remain as we work toward eradication.

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HIV/AIDS, malaria, and tuberculosis are often thought of as “the big three” of the great global public health problems affecting the world’s poorest people. However, emerging evidence over the last five years has revealed that neglected tropical diseases (NTDs) represent an important fourth leg to the global health table.

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