Chief executive of the Global Alliance for Vaccines and Immunisation (GAVI), Seth Berkley, poses for a photograph with children in the village of Amanfro April 27, 2012. Berkley's interim goal with GAVI is to save 4 million lives by 2015, and his big mission is for the global health community to get vaccines against every preventable disease to every child who needs protecting. The Alliance, set up in 2000, uses private and government donor backing to negotiate down vaccine prices for the developing world and then bulk-buy and deliver them to countries whose populations need them most. In its first decade, GAVI says it has already financed immunisation that has prevented more than 5.5 million premature deaths from common but life-threatening diseases. Picture taken April 27, 2012. REUTERS/GAVI/2012/Olivier Asselin/Handout

Full Story: GAVI man's mission to "immunize every kid on earth"