UN Secretary General Antonio Guterres has called on the G20 - the world's 20 major industrialised nations - to fund a stimulus package worth trillions of dollars for businesses, workers and households in developing countries.

This was a matter of "enlightened self-interest", he said, to help prevent the virus from spreading and ultimately making a comeback.

He also urged the G20 summit to waive sanctions to ensure affected countries had access to food and essential medical supplies.