Intensive care units (ICUs) are specialist wards within a hospital that care for individuals who are very ill.
They’re geared up with a lot of extremely technical monitoring devices and staff who’ve been specially trained.
Coronavirus patients have problems with their lungs therefore are normally confessed to ICUs so they can get assist breathing.
As Prime Minister Boris Johnson continues to be treated for coronavirus in an ICU, BBC health correspondent Laura Foster explains how they work.
Video by Tobias Chapple, Terry Saunders and Laura Foster.
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