Health alert after measles case detected around Sydney

A woman contracted the disease after coming into contact with an infant who was diagnosed with measles earlier this month.

Authorities have advised people to be alert for signs and symptoms of the condition and flagged multiple exposure sites across the city's western suburbs.

The case prompted a warning for multiple exposure sites across Sydney between March 24 and March 29.

NSW Health said anyone who was at the following places could have been exposed to the virus and should monitor for symptoms:

Dr Conrad Moreira, Acting Director of the Public Health Unit at Western Sydney Local Health District said there was no ongoing risk to the public, but said it was important those who attended the locations looked out for symptoms of the highly-infectious condition.

"Symptoms include fever, sore eyes, runny nose and a cough followed three or four days later by a red, blotchy rash that spreads from the head to the rest of the body," Dr Moreira said.

Measles is spread through the air when an infectious person coughs or sneezes.

"It can take up to 18 days for symptoms to appear following exposure to a person with measles. Anyone who develops symptoms should see their GP and call ahead to make sure they are not put in the waiting room with other patients," Dr Moreira said.

"Measles is highly infectious and anyone born during or after 1966 needs to make sure they have received two doses of measles vaccine to be properly protected."