Call the Midwife - Those who watched our Christmas Special will have seen a major story strand involving the scourge of polio, and treatment involving a machine called a negative pressure ventilator -
The Public Health Interventions for Polio Were Restrictive, and So Were the Iron Lungs | History of Vaccines
![Meet longest surviving iron lung patient kept alive by a machine for 70 years | Guinness World Records Meet longest surviving iron lung patient kept alive by a machine for 70 years | Guinness World Records](https://www.guinnessworldrecords.com/Images/iron-lung-patients-and-nurses-split-image_tcm25-741912.jpg)