NAT 013/20: Coronavirus (COVID-19) pandemic: Updated travel restrictions and advice from the Australian Government:

Due to the Coronavirus (COVID-19) pandemic, the Australian Government has imposed travel restrictions on travellers arriving from overseas. From 20 March, non-permanent residents will not be allowed entry to Australia. The exclusion applies to business visa holders such as those on the 482 visa which replaced the 457 visa. All people travelling or returning to Australia will be required to self-isolate for 14 days, including Australian citizens. The Government’s travel advice is at its highest for Australians: Level 4 - Do Not Travel.