Back in June 2013, the human cost associated with legionella was on full display when 60-year-old cancer patient John Pearson died after contracting the disease at the Wesley Hospital in Brisbane.

The disease is an infection of the lungs caused by legionella bacteria which are found most commonly in water and soil and can be present in water cooling systems in cooling towers as well as water in other settings such as whirlpool spas, plumbing and shower heads. Unfortunately, that outbreak…