A fifth case of measles in Queensland has sparked a major health alert after the infected person visited a public hospital and travelled on a train.
The latest case is not related to previously confirmed cases, heightening concern among health authorities.
They have issued a measles alert for the city of Ipswich, west of Brisbane, where the infected resident visited a hospital on August 26, August 30 and on September 1.
The person also travelled on a train from Dinmore to Ipswich on August 30, unaware they had the highly infectious disease.
Public health physician Dr Heidi Carroll says measles is a serious viral infection that causes fever, a cough and a runny nose followed by a red spotty rash and sore eyes.
"Symptoms usually start around 10 days after infection but sometimes longer so anyone who develops measles-like symptoms within the next week or two should contact their GP for advice," she said in a statement.
The four cases of measles previously confirmed had been spread by passengers travelling between Queensland, NSW and Victoria.
Meanwhile, Queensland health authorities are also battling serious outbreaks of E coli and norovirus.
There are 132 confirmed cases of norovirus in the southeast, after two more people were found to have the form of viral gastroenteritis on Thursday.
The norovirus outbreak has mostly hit the elderly, with 69 of those affected living at an Ipswich nursing home.
Patients and staff at Ipswich Hospital, Boonah Health Service, Caloundra Hospital and Nambour Hospital have also been hit by the disease.
The E coli outbreak originated from animals at Brisbane's Ekka Show and has so far infected 44 people after another four cases were confirmed on Friday morning.
A Queensland Health spokesman said the number of cases was likely to increase as authorities waited for more samples to be tested.