Two measles alerts have been triggered across Sydney health districts after two people, suspected to be infected with the disease, came in contact with the public in multiple locations.
One patient is suspected to have contracted the disease in Melbourne, which is in the grip of an outbreak, with 11 cases recorded in the past fortnight.
Authorities there are concerned infectious people have visited a number of crowded areas including the MCG, central business district and Melbourne Airport.
The Northern Sydney Local Health District on Tuesday warned the NSW patient spent time in Warringah, Brookvale and Parramatta in late September while they were infectious.
The district's public health director, Michael Staff, urged locals to watch for symptoms including a rash, fever, sore eyes and a cough.
"It's very important to prevent further spread of this serious illness," he said in statement.
On Tuesday evening, the South Eastern Sydney Health District issued a warning for the Sutherland Shire after another infected person visited multiple areas.
Cronulla Mall, the Royal Hotel Sutherland, shopping centres and Sutherland Hospital were all visited by the infected person between September 25 and October 1.
There have now been 25 cases of measles across NSW in 2017, including more than a dozen in western Sydney.
Most cases from Melbourne have been linked to the Collins Square office building at Docklands.
The highly contagious disease is spread through the air.
"People with measles symptoms should stay home from school or work and not go out in public," Dr Staff said.
Measles can result in serious complications, especially for young children or those with weakened immune systems, he said.
Adults born after 1966 who do not have records of receiving two doses of the measles vaccine, or evidence of previous infections, are susceptible to the disease.
The vaccine is free for anyone aged between one and 51 years.
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