The Global Alliance for Vaccines and Immunization (GAVI) is to sell bonds in Japan with higher-than-average yields to help fund a programme that provides vaccinations to children in poor nations, Bloomberg.com reports. GAVI, which was co-founded by the Bill & Melinda Gates Foundation, hopes to raise as much as $500 million by selling the three-year uridashi bonds this month, twice as much as its previous issue last March, when it raised $223 million in Japan selling uridashi bonds denominated in South African rand.