A video shot in the slums of Kolkata stars people with Leprosy and TB  along with hundreds of schoolkids, medics and aid workers.

There is even a 90-year-old granny who had a hip operation just a month before.

The video was inspired by an incident at Calcutta Rescue's TB clinic in North Kolkata last November. Two women being treated for the disease, which kills 300,000 every year in India, were told their tests had come back clear. They were so overjoyed that they started dancing in the middle of the clinic - to the amazement of staff and patients.

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Sean Duggan, heard about what had happened and had the idea to create a dance video involving every aspect of the charity's work.

He said: "I thought, yes! That is what we are trying to do, bring happiness and hope back into people's lives. 

"So many people think about this work as relentlessly depressing. But it isn't. Both the charity's staff, and the people they serve, show so much resilience and love of life. And what better way to demonstrate that than through dance, for which India is rightly famous?"

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Photographer Jake Roos, showing dance footage to patients at Calcutta Rescue's Leprosy clinic. 

Along with British photographer and musician, Jacob Roos, he flew out to the city earlier this year to film staff, patients and schoolchildren at all 12 locations where it is based. 

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They used the track Living in the City by British artist Rhys Lewis, as its words and music resonated with the charity's work so well - Rhys let them use it for free.

It was a gruelling few weeks working in 38 degrees heat, during which Mr Duggan almost lost several fingers in a ceiling fan while testing out whether benches would take the weight of dancing patients. 

Last week, after several months of editing, the video was finally released on YouTube and Facebook and has already attracted 12,000 views.

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Sean Duggan, Suchandra Chatterjee, interpreter and media assistant at Calcutta Rescue, and Jake Roos.

The film was shot at zero cost to the charity, which believes in spending donations where they are most needed, providing the frontline services which last year supported 17,000 of the poorest people last year, including 600 youngsters in education.

The charity hopes people will watch and share this video widely on social media so many more people will learn about its work.

To find out more about the charity click here