US EditionLegionnaires’ Death Reported, Outbreak Declared
LONDON, ONTARIO, JUL 8 – Health officials are investigating the outbreak linked to water systems in London, Ontario, where 43 cases were reported in one week during peak season, including one death.
- The Middlesex-London Health Unit declared a Legionnaires' disease outbreak on July 8, 2025, reporting one death and 43 cases in southeast London within a six-kilometre radius.
- A comparable outbreak occurred the previous year in London’s east end, resulting in 30 reported cases and two fatalities, although it remains unclear if the current incident originates from the same source.
- Legionella bacteria thrive in water sources like cooling towers, hot tubs, and parts of air-conditioning systems, and the health unit is investigating while advising property managers to maintain and sanitize cooling equipment.
- Public Health Ontario states most legionellosis cases occur between June and September with July having the highest counts, and notes most people exposed do not become ill but older, immunocompromised, or lung-compromised individuals face greater risk.
- Officials encourage anyone with symptoms like fever, cough, or shortness of breath to seek medical care and note that Legionella spreads through aerosolized water droplets, not person-to-person transmission.
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12 Articles
Legionnaires’ Disease Outbreak Leaves One Dead, More Than 40 Infected in London, Ontario
London, Ont., public health officials have declared an outbreak of legionnaires’ disease in the region, which officials say has left one person dead and more than 40 others infected. The Middlesex-London health unit says there have been 43 cases of legionnaires’ disease in the city of London this year, one of which led to the death of the individual, according to a July 8 news release. Most of the cases took place over the last week and nearly a…
One person died and 43 others were infected with a new outbreak of legionellosis in the city of London, Ontario.
Legionnaires' disease leaves 1 dead, over 40 sick as outbreak spreads in London, Ont.
One person has died and over 40 people have become ill in a legionnaires' disease outbreak in London, Ont., says the Middlesex-London Health Unit. It's working with the province to investigate the source of the outbreak, the second in the city since last summer.
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