A Victorian woman diagnosed with measles may have infected others while travelling between Melbourne and Brisbane, but authorities still haven't identified the source.
Victorian and Queensland health authorities are urging anyone who develops measles-like symptoms to seek medical advice after they determined the woman was infectious while travelling interstate.
The woman would have been infectious when she was in Shepparton, Melbourne and Brisbane, according to Victoria's health department.
It's believed the woman became infected in Victoria through contact with someone who had travelled overseas.
"We haven't been able to ascertain who that was," a department spokesman told AAP.
The woman was in Geelong, central Melbourne and the bayside suburbs in the period before her measles infection.
She had the potential to pass on the infection while she was in Shepparton between June 21 and June 25.
The woman travelled by V/Line train to Southern Cross Station on June 25, and Melbourne Airport where she flew Jetstar to Brisbane and returned to Melbourne on June 28.
While in Brisbane she caught the Beenleigh train from the airport and visited the Beaudesert Fair Shopping Centre during her stay.
Measles has an incubation period of up to 18 days, and people remain infectious for many days.
The infection usually begins with common cold symptoms such as fever, sore throat, red eyes and a cough.
The characteristic measles rash usually appears three to seven days after the first symptoms, and generally starts on the face and then spreads to the rest of the body.
