Call for more vaccines in poorer countries

The BBC's medical correspondent, Fergus Walsh, has been to Sierra Leone to see what progress is being made in improving child health. It has one of the highest rates of child mortality, but there are signs of improvement.

The Global Alliance for Vaccine and Immunisation (GAVI) is holding a summit in London on Monday 13 June, asking world leaders to pledge more money for vaccination programmes in poorer countries.

Fergus Walsh spoke to David Ferriera, managing director of innovative finance at GAVI, and found out how much money they are calling for.