An international student has become the third overseas traveller this month to contract measles in south-east Asia before returning to Melbourne while contagious with the viral infection.

A measles alert has been issued anyone who visited Melbourne Central, Emporium shopping centre and RMIT University between February 12 and 20.

The man returned from southeast Asia with measles and visited HOYTS cinema at Melbourne Central. Credit:Craig Sillitoe

The teenage RMIT student, who also lives in the CBD, is being treated in isolation in hospital.

It comes after two other people who travelled to the Philippines and India respectively contracted measles before returning to Melbourne.