Queensland LNP senator Susan McDonald has tested positive to coronavirus.

Key points: Senator Susan McDonald is the second Australian politician to test positive for COVID-19, after Home Affairs Minister Peter Dutton

Senator Susan McDonald is the second Australian politician to test positive for COVID-19, after Home Affairs Minister Peter Dutton Senator McDonald is in hospital receiving treatment

Senator McDonald is in hospital receiving treatment The Home Affairs Minister has now left hospital but remains in self-isolation

In a statement, the Coalition senator said she began feeling unwell with a sore throat and mild temperature on Friday evening just hours after Home Affairs Minister Peter Dutton confirmed his positive diagnosis.

Her office said the two members of Federal Parliament did not recently have contact.

"On Friday evening I began feeling unwell with a sore throat and a mild temperature," Senator McDonald's statement said.

"Unfortunately the test has today come back positive and I have now been admitted to hospital, where I will remain under the direction of Queensland Health."

The Senator said she went into self-isolation after taking the test.

Her office is closed and staff members say they have also gone into a voluntary quarantine at home but none of them are reporting having any symptoms.

Two other MPs underwent tests for coronavirus last week, but both were cleared of the illness.

Peter Dutton self-isolating at home

Mr Dutton returned a positive result for the virus on Friday and was admitted to hospital in Brisbane.

He told Sky News on Monday that he has since been able to return home and is self-isolating after his family had found a friend's house to stay at.

In the interview, Mr Dutton also lashed out at two other travellers who said they had tested positive for COVID-19 after being on the same plane as him.

Prisoner advocate Debbie Kilroy and activist Boneta-Marie Mabo said they had been confirmed as having coronavirus since the flight.

Ms Mabo is the granddaughter of Indigenous land rights campaigner Eddie Mabo.

Deputy chief medical officer Paul Kelly said after speaking to the Home Affairs Minister, he believed Mr Dutton was not infectious when he was on the plane.

"Whether he caught it on the plane or before that, it's hard to know. The incubation for this particular virus is quite long. It can be up to 14 days. He had been back in Australia for six days by the time he became sick," Mr Kelly said.

Mr Dutton told Sky News that Ms Mabo and Ms Kilroy were trying to take advantage of the situation.

"It's ridiculous. You can look at examples where people are trying to use the sickness of somebody else or the coronavirus as an opportunity to push their own political cause and I think this is one such example," Mr Dutton said.

"I actually think it's an outrage."

Mr Dutton said he has been advised the two women sat "nowhere near" him on the flight to the United States.

He accused Ms Kilroy and Ms Mabo of being long-standing opponents of the government, who detested him because of his border policies.

"They're involved in prisoner advocacy and all sorts of left-wing causes and frankly, I just don't want to give them the publicity they're seeking."

Other politicians test negative

Treasurer Josh Frydenberg sought medical advice after feeling sick last Thursday, the same day he handed down the economic stimulus package with the Prime Minister in Canberra.

Mr Frydenberg had travelled to Saudi Arabia's capital Riyadh just over two weeks earlier.

He took the test on Thursday afternoon, but continued to conduct a series of media interviews in the evening and the following morning.

The negative test results did not arrive until Friday afternoon

"The medical advice to me was not to go and self-isolate. I'm pleased the test came out negative," Mr Frydenberg told Sky News on the weekend.

Labor frontbencher Tanya Plibersek took a coronavirus test after attending a conference with someone who later discovered they had COVID-19.

She said she self-isolated while the test was being reviewed.