A Queensland nurse who tested negative for the deadly Ebola virus after returning from Sierra Leone will remain in quarantine in a Cairns hospital.

Sue-Ellen Kovack, 56, returned to Australia on the weekend from treating patients in the Ebola hotspot, where she worked with the Red Cross.

While she returned home healthy, her temperature rose to 37.6 degrees Celsius on Thursday morning.

She was assessed by an infectious diseases specialist at Cairns Base Hospital, where she works, and underwent blood tests which were sent to Brisbane to be tested for the virus on Thursday.

Her blood has tested negative for the disease, meaning she did not contract the deadly virus while working with infected patients.

But she will remain in observation for the next 24 hours and will not be given the all-clear until the incubation period ends.

Queensland chief health officer Jeannette Young said the negative test result and the fact that Ms Kovack's symptoms were not getting any worse was a good sign.

Sorry, this video has expired Cairns nurse tests negative to Ebola ( Leonie Mellor )

"We can't actually give the total clear at this stage because she's still within the 21-day incubation period," she said.

"Although her fever resolved this morning she still is a little bit unwell, so we also do want to find out whether she's picked something else up.

"If she's got the infection, she'll get sicker - at the moment she's getting better so we'll just keep her under very close observation."

Dr Young said the broader community was not at risk from Ebola.

"There is no concern here from the community - from this nurse's potential case or indeed from any case coming into the country," she said.

Her friends and family were not able to visit her yesterday.

11 negative test results in Australia

A total of 11 people have now been tested in Australia for Ebola and all results were negative, Health Minister Peter Dutton told reporters.

He said Australia had set up measures to screen people arriving in Australia from areas that are affected.

Mr Dutton said it was unlikely to introduce thermal scanning at airports, a measure used to detect people with the Ebola virus.

Britain introduced entry screening at the Heathrow and Gatwick airports, as well as the Eurostar rail link with Europe to cope with the threat.

Mr Dutton was confident Australia's quarantine controls were tighter than other nations such as Britain.

"We can screen those people as we're doing at the moment and there's information at airports, so I think in a way we're ahead of the game," he said.

But the head of Katter's Australian Party, Bob Katter, said the case showed Australia's quarantine system needs to be overhauled.

"That people could go over there working with Ebola patients and be allowed back into this country without any quarantine - I mean stay in your home - that is just a joke," he said.

"If I was the prime minister I would be hauling in all and sundry with this shocking protocol set by the Government."

Ms Kovack is the second Australian to have a highly publicised test for the Ebola virus after a West Australian man was tested at the Gold Coast for the deadly virus in September.

Overnight Macedonia authorities sealed off a hotel and quarantined staff and a guest after a British man with Ebola symptoms died.

Samples have been sent to Germany for tests to confirm the cause of the man's death.

Meanwhile, the health of a Spanish nurse who is the first person known to have caught Ebola outside Africa worsened, the Madrid hospital where she was being treated said.