Two cases of measles have been confirmed in people who may have been infectious while in Victoria.
Doctors and hospitals have been warned to be on the lookout after the infected people visited a number of busy locations in the greater Melbourne area.
Infections are possible among people who were at the UNITE Syro-Malabar National Youth Conference at Phillip Island until 3pm on December 10, acting deputy chief health officer Finn Romanes said on Thursday.
Anyone at Melbourne airport between 10.30am and 11.30am on December 11 and on Tiger Airways flight TT665 from Melbourne to Canberra that left at 11.30am is also potentially at risk.
An infected person was also at David Jones in Melbourne between 12.30pm and 2.30pm on December 22 and Queen Victoria Market between 2.30pm and 4.30pm the same day.
The alert is for patients with fever at the onset of a rash, particularly among people who were at any of the above places within seven to 18 days of falling ill.
