A 21-year-old woman has become the fourth person in NSW to test positive for coronavirus as the state government says most children who have holidayed in China can return to school this week.
NSW Health on Monday said the university student was being treated in isolation at Westmead Hospital after arriving in Sydney from Wuhan - the epicentre of the outbreak - last week.
The UNSW student arrived on the last flight out of Wuhan to arrive in Sydney on Thursday.
"She travelled on the plane back, she was met at the airport, she received the fact sheet which said if you become unwell then seek care and these are the signs and symptoms," NSW chief health officer Dr Kerry Chant told reporters.
"She developed some symptoms 24 hours later and they worsened and she presented to the emergency department."
The woman showed no symptoms when she arrived at the airport but was placed in home isolation once she began exhibiting flu-like symptoms.
NSW Health said she only had limited contact with people in Australia - reducing the likelihood that she had spread the virus.
"The student did not attend any classes at the university and stayed on her own in campus accommodation with no close contact before she was admitted to hospital," a UNSW spokeswoman said in a statement.
NSW officials on Monday evening confirmed they were testing five patients for possible infection.
Three men - aged 35, 43 and 53 - are already being treated in hospital for coronavirus and are listed as stable.
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.
Dr Chant said healthy school children who travelled to China during the holidays would not be told to stay at home when classes return.
Even those who have been to Wuhan or the Hubei province will be allowed to return to school but Dr Chant said they should be carefully monitored for any symptoms.
Only children who have been in close contact with someone confirmed to have coronavirus will be asked to stay at home, the state's chief health officer said.
"We're only recommending exclusion for children who are close contacts of a confirmed case," she said.
"(But) if you've come back from Wuhan or Hubei more broadly, and you're unwell, then we suggest you get assessed. We also don't want flu being transmitted and other infectious diseases."
Australian Associated Press