Polio used to be one of the most feared childhood diseases. It can attack the nervous system and - in just a few hours - leave someone paralysed.
If it paralyses the chest muscles, people are unable to breathe.
And the sarcophagus-like iron lung, which uses bellows to keep the patient breathing, was once a common sight on polio wards.
But all this feels like a long-forgotten era - and for good reason.
Read more at: https://www.bbc.co.uk/news/health-62492791