Brisbane's southside on measles alert

It's likely he was infectious when he visited the Underwood Marketplace shopping centre between 9am and 11.30am last Thursday, 17 April, health authorities say.

Public health physician Dr Kari Jarvinen said people who were at the shopping centre around that time have been requested to contact their GPs immediately.

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 number of people