Another two people evacuated from the Diamond Princess cruise ship to Darwin have tested positive to coronavirus, taking the total to four.

On Friday night health authorities confirmed that two women from Queensland, aged 54 and 55, had been diagnosed and were being flown to Brisbane for further treatment.

Watch the video above: Man with coronavirus on his way to Perth

The announcement comes after a West Australian and a South Australian were flown to Perth and Adelaide respectively for treatment.

The four cases come after a group of people were isolated after presenting minor symptoms at Darwin Airport on Thursday.

After sitting off the coast of Japan for some time, Australian passengers were evacuated to the Howard Springs camp, approximately 30 kilometres south-east of Darwin, where they will spend the next two weeks in quarantine.

The first two infected patients are in a stable condition and in isolation at Sir Charles Gairdner Hospital in Perth and Royal Adelaide Hospital.

The government’s chief medical officer Brendan Murphy said the flight from Japan to Darwin was taken using extreme precautionary measures, but more cases could be confirmed in the coming days.

“Because of what’s been happening over the last week in Japan and on the cruise ship, it’s possible that more people could develop positive tests over the next few days,” he said.

Travel ban extended

Meanwhile, Australia has extended its ban on foreign travellers from China for another week as the number of infections and deaths in the coronavirus epicentre of Hubei province continues to grow.

The government is reportedly considering easing the ban for students.

Prof Murphy said it was up to the government to consider the risks and benefits of doing so.

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“At the moment our advice is that it should be maintained and reviewed in the next seven days,” he said.

Prime Minister Scott Morrison has ruled out compensation to tourism operators and universities hit by the travel ban.

“Coronavirus’ impact is right across the country,” he told reporters on Friday.

“The taxpayer ... is not an insurer for these things.”

- with AAP