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.

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