Thirty people in the past 100 days have been diagnosed with measles in NSW, with the latest becoming exposed to the highly contagious disease in a GP waiting room.
The young woman likely acquired the infection while at an Eastwood medical practice in mid-March, when an infectious patient who caught measles in Thailand was also present.
The case, confirmed on Thursday, means the rate of diagnosis since Christmas Day has averaged more than two a week.
Earlier this week, two babies too young to be vaccinated were confirmed to have caught the disease in Sydney.
"We eliminated measles in 2014 but over the years we do have a few outbreaks," NSW Health's communicable diseases director Dr Vicky Sheppeard told AAP on Thursday.
"And the most common place to spread measles is in a hospital emergency department or a GP waiting room.
"A person with measles is coughing the virus into the air and in the close quarters of a GP or hospital waiting room, large numbers of people are exposed."
Dr Sheppeard urged people who feel ill and show symptoms of measles, such as a cough and a rash, to call ahead to their GP.
"That way, when you arrive, you can be put into a room away from other people.
"In GP practices, we have infants and people with poor immune systems so it is a high-risk place."
NSW Health warns the woman diagnosed in the latest case visited several areas between March 28 and April 1, including Epping, Redfern, Alexandria and Auburn.
Those who may have crossed paths should monitor themselves for symptoms until April 19.
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