It’s found in India and is one of the most deadly diseases in the world – Kala Azar.
It’s official name is Visceral Leishmaniasis, also known as Black Fever, is almost always fatal.
But now a new drug has been licensed, tested and brought to the people of India by the Institute for OneWorld Health, and the hope is it will make a huge difference to the battle against one of the most deadly diseases in the world.
We travelled to India to see what impact the new drug is having.
Winner of most popular documentary of the year on BBC World.
Part of a 29 x 25-minute documentary series produced for the BBC. These films can be bought individually or as a series.