Malaria vaccine: What you need to know

The World Health Organization has described the "long-awaited" malaria vaccine for children in Africa as "a breakthrough for science and child health".

Malaria has been one of the biggest scourges on humanity for millennia and mostly kills babies and infants.

The vaccine - called RTS,S - was proven effective six years ago.

Here's what you need to know about who developed the vaccine, the cost and the distribution of it.