Major investigation into listeria outbreak across four states

A Mater Hospital Brisbane spokesperson confirmed cases of listeria had been reported, with a team of public health experts working to determine the source.

Listeriosis is a rare disease that often presents with few or no symptoms in healthy people.

The source of infection is currently unknown, as no single common food was able to be linked to all cases.

Queensland Health Chief Health Officer Dr John Gerrard said several potential food sources are under investigation.