Published On: Wed, Aug 6th, 2025

What is legionnaires’ disease, the bacterial infection behind outbreaks in Ontario and N.Y.?

Cooling towers are seen in the Harlem neighbourhood amid a legionnaires' disease outbreak in New York City, in August 2025.

Legionnaires’ disease is in the headlines this week after public health officials in southwestern Ontario declared an outbreak.

CBC | World News

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What is legionnaires’ disease, the bacterial infection behind outbreaks in Ontario and N.Y.?