Passengers on board a Melbourne-bound Garuda Indonesia flight have been warned to be on high alert for measles after an unvaccinated toddler traveled with the disease.

Victoria’s deputy chief health officer Brett Sutton is urging anyone who was on board the flight showing symptoms to seek treatment after a 3-year-old child was admitted to a hospital over the weekend after flying into Melbourne from Jakarta on Garuda Indonesia Flight GA 716 on May 13.

“Anyone developing symptoms is advised to ring ahead to their general practitioner or hospital first and tell them that they have fever and a rash,” Sutton said in a statement Monday.

“If you know you have been in contact with a measles case, please alert your GP or hospital emergency department.”

In a statement issued to doctors and hospital emergency departments about the incident, it says the toddler acquired the infection while in Indonesia and medical staff should be prepared.

“Be alert for measles in patients presenting with a fever at rash onset, particularly associated with international travel,” Sutton said.

“Isolate suspected cases to minimize the risk of transmission within your department/practice.” Measles symptoms usually present similarly to common cold symptoms before developing into a rash three to seven days later.

The health department says people ages 26 to 42 have the lowest immunization coverage to the disease, but those of any age who are immunocompromised are also at higher risk. This includes people undergoing cancer treatment or on high-dose steroids.