Bali holidaymakers and visitors to the Sydney Opera House are among hundreds urged to look out for measles symptoms after a young woman and infant contracted the disease.
The two new cases take the number of people infectious with the highly contagious disease in the state since Christmas to 19, NSW Health said on Monday.
In one case, a woman aged in her 20s developed the measles rash after arriving in Sydney from Bali on Qantas flight QF44 about 6.30am on February 21.
