An in-depth graphic explainer of ventilators, what they are and why they are critical to treat the worst symptoms of COVID-19.
Ventilators are mechanical breathing devices that use pressure to blow air - or a mixture of gases such as oxygen and air - into the lungs. They are crucial to the care of people with lung failure, one of the complications suffered by patients with severe cases of COVID-19.
Doctors say that COVID-19 symptoms can develop rapidly. Some patients deteriorate from having a relatively mild infection to being in a critical condition in a matter of days.