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Legionella in Ontario: A Call for Stronger Regulations
In 2025, Ontario was shaken by a serious outbreak of Legionnaires’ disease, caused by the bacterium Legionella pneumophila.
This bacterium thrives in stagnant water and poorly maintained systems (cooling towers, plumbing networks, fountains, spas). When inhaled as microdroplets, it can cause a severe lung infection, similar to pneumonia, that can be fatal for vulnerable individuals.
In London, Ontario, the contamination was traced back to the cooling towers of a food processing plant. The toll was heavy: 94 cases, 86 hospitalizations, and 4 deaths (CBC News, 2025).
Lab tests confirmed that the strain of Legionella found in patients matched the one present in the cooling towers. Despite a cleaning program in place, the bacteria thrived thanks to ideal conditions—heat, humidity, and water stagnation—that allowed recolonization of the system.
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