A new virus cluster in south Australia has been linked to 17 infections so far after a worker from a quarantine hotel infected family members.

The news has stoked fears of a new virus hotspot within the country.

South Australian Premier Stephen Marshall.

I would like to advise that all inbound international flights to Adelaide have now been suspended at our request for the remainder off this week.

Our priority is ensuring that we have enough Medi hotel capacity to meet any local quarantine requirements.

At this morning I received a call from the prime minister and I accepted his offer for increased support from the Australian Defense Force.

The news has prompted neighboring Western Australia toe order, mandatory testing and self isolation for 14 days for new arrivals from South Australia.

The island state of Tasmania also ordered immediate self isolation for South Australian arrivals, while the Northern Territory will now mandate supervised quarantine.

Meanwhile, Australia's two most populous states, New South Wales and Victoria, have yet to announce any changes to border controls ever since Victoria emerged from a lengthy lock down earlier this month to contain it's own outbreak.

Australia had previously recorded several days of no new locally transmitted cove in 19 infections.