First Lady Dr Christine Kaseba and Melinda Gates (second from left) being congratulated by WHO Director-General Margaret Chan (r) after their Key note address to the World Health Assembly at UN Building in Geneva on May 21,2014

First Lady Dr Christine Kaseba and Melinda Gates (second from left) being congratulated by WHO Director-General Margaret Chan (r) after their Key note address to the World Health Assembly at UN Building in Geneva on May 21,2014

First Lady Dr Christine Kaseba and Melinda Gates (second from left) being congratulated by WHO Director-General Margaret Chan (r) after their Key note address to the World Health Assembly at UN Building in Geneva on May 21,2014

First Lady Dr Christine Kaseba and Melinda Gates (second from left) being congratulated by WHO Director-General Margaret Chan (r) after their Key note address to the World Health Assembly at UN Building in Geneva on May 21,2014

Melinda Gates (l) with WHO Director-General Margaret Chan (r) and First Lady Dr Christine Kaseba shortly before delivering their key note address to the World Health Assembly at UN Building in Geneva on May 20,2014