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

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

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

Melinda Gates and First Lady Dr Christine Kaseba being congratulated by WHO Director-General Margaret Chan (r) and WHO president Roberto Morales Ojeda (second from right) after delivering their speeches at World Health Assembly