Most people with coronavirus will recover within about a week of getting symptoms and will not need medical care.
But some people will need to be treated in hospital – including the prime minister.
Boris Johnson, who is 55, is currently being cared for in St Thomas’ hospital in London after his symptoms worsened.
He has been receiving oxygen, but has not needed a ventilator machine to help his breathing.
Which people can get sick?
Some people are at higher risk of complications.
This includes people over the age of 70, regardless of whether they have a medical condition or not, and people of any age with underlying health conditions, such as heart disease.
There are more than 1.5 million people in the UK who are at