David Cameron pledges more money to fund child vaccines

Prime Minister David Cameron has pledged £814m to help vaccinate children around the world against preventable diseases like pneumonia.

He made the announcement at a summit in London where countries are being asked to give an extra £2.3bn ($3.7bn) by 2015 for child vaccines.

The Global Alliance on Vaccines and Immunisation says this could help save four million lives in four years.

Fergus Walsh reports.