NSW authorities are expected to on Monday confirm the fifth case of coronavirus in the country after a patient tested positive during preliminary exams.

NSW Health on Sunday said that a patient had preliminarily tested positive to the virus and was undergoing further examination.

They have already been isolated in hospital and authorities were seeking to track down people who have been in close contact with the person in recent weeks.

"Public health follow-up of this probable case is being undertaken in accordance with the national guidelines and the patient remains in isolation," NSW Health said in a statement.

They said they expected to confirm their diagnosis on Monday after on Sunday clearing four patients who had undergone testing.

Three patients in NSW and one in Victoria have already been diagnosed with the virus after an outbreak centred in the Chinese city of Wuhan which has spread across the world.

Three men aged 35, 43, and 53 are being treated in a Sydney hospital but are listed as being stable and NSW Health Minister Brad Hazzard on Sunday said he was pleased with their progress.

Authorities have now spoken to all but two people who have been in close contact with the three men since they arrived from China.

"There are a small number of people we're still trying to contact but substantially we have made contact," NSW chief health officer Dr Kerry Chant said.

In Victoria, a man in his 50s is being treated at Monash Medical Centre while four of his family members are being quarantined at home.

A further 11 patients are now awaiting test results.

Queensland chief health officer Dr Jeannette Young said authorities were attempting to contact four people who may have come into contact with the Victorian patient after sharing the same flight.

"If these people are unwell, we will assess them for coronavirus," Dr Young said.

There have been zero reports of the virus in Queensland after six patients all tested negative on Sunday.

As health authorities work to track down local cases of coronavirus, the federal government is working with Chinese authorities to get Australians in affected areas home.

They include at least 100 schoolchildren stranded in Wuhan, many of whom are on holiday, The Australian reports.