Brisbane's southside on measles alert

Brisbane's southside is on measles alert after a man was diagnosed with the highly infectious disease.

It's likely he was infectious when he visited the Underwood Marketplace shopping centre between 9am and 11.30am last Thursday, health authorities say.

Public health physician Dr Kari Jarvinen says people who were at the shopping centre around that time should immediately contact their GPs.

Residents in Logan and Brisbane's southside should be particularly vigilant for symptoms, he said.

A red, spotty rash and other measles symptoms, including a fever, cough and runny nose, usually appear 10 days after infection.

Dr Jarvinen said that given the large numbers of people potentially exposed to the latest infection, further measles cases could emerge in Brisbane over the next few weeks.