The ban was announced this morning during a press conference in which Morrison specified what constitutes an essential gathering.
While non-essential gatherings such as social activities and entertainment will be banned, the Prime Minister expanded on what spaces came under the "essential" umbrella.
In Australia, the Department of Foreign Affairs and Trade increased its travel advisory to its highest level, level 4, telling Australians: "Do not travel overseas at this time". That is very clear instruction.
"This is done to protect their health and to limit their exposure, given we have so many countries now that are affected by the coronavirus", Prime Minister Scott Morrison said on Friday.
Indoor non-essential gatherings will now be limited to 100 people, while a 500 person limit remains in place for outdoor gatherings.
Fourthly, Morrison disseminated general health advice about social distancing, instructing all Australians to keep personal space as much as possible, whether it means getting into an Uber, or travelling on public transport.
Mr Morrison said the ban is effective immediately.
Australia joined neighbouring New Zealand Wednesday in urging citizens overseas to return home promptly or risk being stranded in an ominous sign they expect flights to the remote South Pacific nations may shut down entirely.
The Federal Government has warned the economic downturn from the outbreak will see Australians lose their jobs and businesses close down.
"It's ridiculous, it's un-Australian, and it must stop", Morrison said.
Labor leader Anthony Albanese has pledged his support for efforts to contain the pandemic, saying he wants "to help the Government get it right".
A spokesman for national carrier Qantas said it would continue issuing tickets to Australians wanting to leave the country.
As of Tuesday afternoon, only people who have recently travelled from overseas or have been in contact with a confirmed COVID-19 case and experienced symptoms within 14 days are advised to be tested. "We're all in this together".
"We have a narrow window of opportunity to prevent the spread of the virus into our communities", said Aboriginal Medical Services Alliance Northern Territory CEO John Paterson.