A Macquarie University student has become the 35th case of measles in NSW since Christmas with health authorities warning people they should be vaccinated before travelling.
The woman in her 20s was unknowingly infectious at various locations across Sydney, Maitland and Wyong between Wednesday April 3 and Sunday April 7.
"We cannot stress enough the need for holidaymakers to be vaccinated before travelling to Southeast Asia," NSW Health's communicable diseases director Vicky Sheppeard said in a statement on Wednesday.
"The majority of cases we are seeing are being brought home."
NSW Health says the university student, however, acquired the measles infection in NSW.
Dr Sheppeard said people who'd visited the same locations at the same time should be alert for symptoms until April 23.
Measles symptoms include fever, sore eyes, a cough for three or four days followed by a red, spotty rash that spreads from the head down the body.
The young woman visited F45 Haymarket on Wednesday morning and Macquarie University later that afternoon and the next day.
She travelled on Friday morning from Central Station to Maitland on the XPT service, where she visited Lavenders Riverside Cafe and Hunter Valley Grammar School.
Later that day, she took the train from Wyong back to Sydney.
She visited the Sydney Harbour Bridge Climb office between 4.45am and 9.30am on Saturday and on Sunday she presented at Maitland Hospital's emergency department.
People who were in the emergency department at the same time are being contacted.
This the 85th case of measles in Australia this year. The nation recorded 103 cases in 2018 and 81 in 2017.
Those unaware of whether they've had two doses of the measles vaccine can look it up on the Australian Immunisation Register which has records from 1996.
The vaccination is free from anyone born after 1965.
"It is safe to get another jab particularly if you are going overseas," Dr Sheppeard said.
