Over a rising COVID-19 cluster in Adelaide’s northern suburbs, South Australia has been effectively shut out of half the country.
The new state to lock out travellers coming from South Australia has become Queensland.
Premier Annastacia Palaszczuk declared that from 11.50pm on Monday, Adelaide will be considered a COVID-19 hotspot.
She follows in the footsteps of Michael Gunner, Chief Minister of the Northern Territory, who said the danger posed by the new outbreak was too great for the Territorians to allow the border to remain open.
Those coming from South Australia to the NT will be expected to self-isolate for two weeks upon arrival in a supervised facility.
Mandatory quarantine has also been enforced by Tasmania for those coming from South Australia.
Anyone who has entered Tasmania since last Monday from South Australia will also be forced to enter isolation, effective immediately.
A mandatory 14-day quarantine was imposed by West Australian Premier Mark McGowan on travellers entering his state on Sunday from South Australia.
When they arrived in Perth, some travellers were told they would have to self-isolate.