The Bill and Melinda Gates Foundation has pledged $750m (£400m) to a worldwide infant vaccination programme (Gavi). The pledge will run over 10 years. The same organisation has also received a $290m pledge from Norway.
"Supporting children's immunisation is undoubtedly the best investment we've ever made," Gates said in a statement. His foundation has made pledges equaling $7bn to good causes over the last 10 years.
Gates said: "In just five years, Gavi's efforts have saved hundreds of thousands of children's lives, and its work in the coming years will save millions more." The funds announced today will support national immunisation programmes in 72 countries.