Queensland's measles outbreak has widened after health authorities confirmed a fourth infected person had attended the Jelly Roll concert.

Metro South Public Health Unit said the person did not know they were infected when they saw the American rapper perform at the Brisbane Entertainment Centre on October 24.

They then visited the Mustang Brothers Football Club on November 8, Mullein Pharmacy Hillcrest on November 12, and Logan Hospital Emergency Department on November 12 and 14.

Three more infected concertgoers were also found to have spent time in the Gold Coast, Brisbane and Wide Bay areas.

Health authorities are conducting contact tracing and will notify anyone who may have been exposed, but urged others who visited the same locations to monitor for symptoms.

The warning comes

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