Guest: Dr. Margaret Harris, infectious diseases expert and spokesperson for World Health Organization

As the pandemic continues, low-income and developing nations remain left behind in vaccination efforts. The reason is simple. Many countries cannot afford vaccines because the contracts tied to them are tied to the most powerful nations in the world. Can a pandemic truly end if billions around the world don't have access to vaccines? COVAX, a program developed by the World Health Organization, is designed to solve that problem by bridging the gap between have and have-not countries. We'll talk about the challenge and cost of delivering doses, the responsibility of rich countries to share, and why failures affect all of us.