Sydneysiders have been warned that measles is probably circulating through the city, more than 10 years after Australia eliminated the highly infectious and potentially deadly disease.

NSW Health said today that someone has caught the virus in Sydney , even though they had not been overseas and hadn't been at any of the known exposure sites in the city.

Because authorities don't know where the person caught the disease, they said it's probably spreading through the local community.

"With the source of the infection unknown, it is likely measles is currently circulating within the community, and other people may have been unknowingly exposed to measles," NSW Health said in a statement.

Residents have been told to check they are up to date with their vaccinations, and to k

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