Encephalitis lethargica, sleeping sickness or "sleep-death" This often forgotten epidemic remains the largest medical mystery of the 20th century. It struck a million people or more around the world, killing about a third immediately and leaving a third more trapped immobile, alive but imprisoned inside their body.

A century later, we still don't know what causes it, how it is transmitted, how to cure it or whether it may happen again.

Kelly and Christina discuss how this sickness affected the north country from its beginning to its strange disappearance.

Episode is edited by Christina Knott. Music is "Smooth Actor" by Podington Bear. Follow us on Facebook and Instagram.

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For more about this topic:

This Podcast Will Kill You: Episode 30

Brain: A Journal of Neurology: "Encephalitis lethargica: 100 years after the epidemic"