UN boss António Guterres calls for an "immediate co-ordinated" global response to tackle the crisis.
The advice comes as the government faces growing criticism over a lack of testing for frontline staff.
However, experts say a fever and a cough are still the main ones to look out for.
A 13-year-old boy who tested positive for coronavirus has died, a London hospital trust says.
The government is working to increase coronavirus tests, Cabinet Office minister Michael Gove says.
Study describes how app would alert citizens if someone they came into contact with tests positive.
New figures offer more information on the toll of Covid-19 but do not give us the full picture.
"Social pressure from others" will be key in persuading the UK to stay at home, a study suggests.
The government in England has changed its mind on home abortion several times.
The test could help diagnose tumours sooner, often before any symptoms, scientists hope.
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