Queensland is grappling with an expanding measles outbreak, as health officials have identified a fourth individual who attended the Jelly Roll concert while unknowingly carrying the virus.

The Metro South Public Health Unit disclosed that this individual was unaware of their infection during the American rapper’s performance at the Brisbane Entertainment Centre on October 24.

After the concert, the infected person visited several locations, including the Mustang Brothers Football Club on November 8, Mullein Pharmacy Hillcrest on November 12, and Logan Hospital’s Emergency Department on both November 12 and 14.

Additionally, three other concert attendees diagnosed with measles were discovered to have traveled through the Gold Coast, Brisbane, and Wide Bay regions.

Health authorities are actively tracing contacts and will inform those who might have been exposed. They also advise anyone who visited these locations to remain vigilant for any symptoms.

The warning comes just days after a Queenslander unknowingly infected with measles visited several locations during their travel to Sydney.

They attended the Oasis concert at ACCOR Stadium on November 8, as well as the Sydney Airport, CBD, Inner West and trains on November 8 and 10.

NSW Health has consequently also issued a measles alert.

“It’s important for people to stay vigilant if they’ve been exposed, and if they develop symptoms, to please call ahead to their GP or emergency department to ensure they do not spend time in the waiting room with other patients,” Health Protection NSW Executive Director Dr Jeremy McAnulty said.

Tens of thousands are estimated to have attended the Jelly Roll and Oasis concerts.

Measles, a highly contagious infection that can lead to a red spotty rash, fever, cough, runny nose and sore eyes, can begin to present itself between 10 to 18 days from the time of contact.

Anyone who believes they may be infected should avoid public spaces and get tested. 

NSW and Queensland health authorities are using the recent cases of measles to remind the public, particularly children and those aged 60 or under, to ensure they are vaccinated against the preventable disease.