How India is tackling polio
One of the world's oldest and most crippling diseases is a step nearer eradication.
India used to have more cases of polio than any other country, but has now been free of the disease for more than a year.
There are just a handful of countries left where the virus is not under control.
The BBC's medical correspondent Fergus Walsh visited a clinic in Delhi to see polio immunisation first hand.
- BBC News