Speaking at the UN headquarters in New York City, Mr Guterres said: “The new coronavirus disease is attacking societies at their core, claiming lives and people’s livelihoods.
“Covid-19 is the greatest test that we have faced together since the formation of the United Nations.”
The UN chief called for “an immediate co-ordinated health response to suppress transmission and end the pandemic”.
Mr Guterres urged the industrialised nations to help those less developed, or potentially “face the nightmare of the disease spreading like wildfire”.
The UN report estimates that up to 25 million jobs could be lost around the world as the result of the outbreak.
It also projects an up to 40% “downward pressure” on global foreign direct investment flows.
What are the latest developments around the world?
Italy remains the worst affected country in the world. Tuesday’s figures show the official death toll rose by 837 deaths to 12,428, more than the 812 recorded on Monday. Moreover, the number of new infections was 2,107, which is greater than the 1,648 the day before (but down from the equivalent numbers last week)
France has recorded 499 new hospital deaths in the last 24 hours, bringing the total to 3,523. This is the highest daily rise in such deaths in France since the outbreak began
A 12-year-old girl has died in Belgium. She is thought to be the youngest Covid-19 victim in Europe. In total Belgium has lost 705 people in the outbreak