NSW Health has warned people to be on the lookout for measles symptoms after three Sydney men fell ill with the infectious disease.
The men, aged between 25 and 35, may have been infected when they recently spent time in Sydney's inner suburbs, including Alexandria, Waterloo, Earlwood and Hurlstone Park.
They also visited medical centres in Rozelle, Croydon and Rockdale and the Royal Prince Alfred Hospital emergency department while infectious in the past week.
NSW Health communicable diseases director Dr Vicky Sheppeard says measles is highly contagious among people who are not fully immunised.
"Measles is highly infectious and is spread through coughing and sneezing," she said.
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"Symptoms can include fever, tiredness, runny nose, cough and sore red eyes which usually last for several days before a red, blotchy rash appears."
Complications can range from ear infection and diarrhoea to pneumonia or swelling of the brain.
Dr Sheppeard warned parents of infants or others not fully vaccinated to watch for signs of measles.
"If symptoms develop, please phone ahead when seeking medical attention to ensure you don't share the waiting area with other patients," she said.
Children should receive two vaccine doses, one at 12 months and another at 18 months, while anyone born after 1966 should have two vaccine doses at least four weeks apart, she said.
NSW Health offers free measles, mumps and rubella vaccine for people up to 47 years old.
