Infection hazard

A mysterious bacterial outbreak has put a Melbourne suburb on alert, with health authorities scrambling to trace its source after multiple people were hospitalised.
The Department of Health is investigating an outbreak of legionnaires’ disease in Craigieburn and surrounding suburbs, with six confirmed cases as of March 18.
All patients developed symptoms in early March and required hospital treatment, prompting an urgent public health response to determine where the infections originated.
Authorities believe the exposure period dates back to late February, with investigations now focused on potential sources such as cooling towers and water systems in the area.
Residents and visitors to Craigieburn, Mickleham, Greenvale and Roxburgh Park have been warned to seek urgent medical attention if they develop flu-like symptoms, including fever, chills, muscle aches and a persistent cough.
Legionnaires’ disease is caused by legionella bacteria, commonly found in natural water sources like rivers and lakes as well as in artificial systems such as spas and large-scale cooling units. The illness, which can be fatal, spreads through inhaling contaminated water droplets but cannot be passed from person to person.
While many people exposed to the bacteria do not become ill, those most at risk include older adults, smokers, and people with weakened immune systems or underlying health conditions.
Health professionals have been placed on alert and urged to consider the disease in patients presenting with severe or unusual pneumonia, particularly if they have recently travelled through the affected areas.
Early diagnosis is critical, with authorities stressing the importance of rapid testing and antibiotic treatment to prevent serious complications, which can include pneumonia and, in some cases, kidney impairment.
The Department of Health has also reminded clinicians that suspected cases must be reported immediately as efforts continue to contain the outbreak and identify its source.