As coronavirus cases climb to more than half a million worldwide, several Australian states have signalled a total lockdown, following the lead of New Zealand.

Meanwhile, the Australian and US economies are, like the rest of the world, taking a huge hit as NSW police hand out fines for those disobeying isolation rules.

G20 leaders pledge $8.2 trillion

This morning world leaders, including Prime Minister Scott Morrison, met via videoconference to commit $8.2 trillion to ensure the flow of vital medical supplies and other goods across borders and to resolve supply chain disruptions.