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Hamilton Public Health Investigating ‘Cluster’ of 13 Confirmed Legionellosis Cases

Health officials are tracing possible exposure sources after 13 confirmed cases, while hospitals monitor for additional patients and no common source has been found.

  • Hamilton Public Health is investigating 13 confirmed cases of Legionnaires' disease reported since Monday. Associate medical officer of health Brendan Lew said the agency is focused on identifying potential sources of exposure.
  • Legionnaires' disease spreads when people breathe in small water droplets containing bacteria, though it does not spread person-to-person. The infection poses higher risk to individuals over 50 or those with weakened immune systems.
  • Focusing on east Hamilton and Stoney Creek, investigators have yet to identify a common source of exposure. Officials are reminding facility operators to maintain water systems and mist-producing devices to prevent further infections.
  • Toronto public health officials confirmed nine cases of Legionnaires' disease earlier this week and are actively investigating the outbreak source in that city.
  • Hospitals have been notified to monitor for potential cases, as the infection may cause high fever and chills. Public health authorities continue reminding residents of proper water system maintenance.
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Winnipeg Free PressWinnipeg Free Press
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Thirteen legionnaires' disease cases confirmed in Hamilton: public health officials

HAMILTON - Hamilton Public Health says it is investigating a cluster of 13 confirmed cases of legionellosis, also known as legionnaires' disease, an infection caused by bacteria found primarily in warm water environments.

·Winnipeg, Canada
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Winnipeg Free Press broke the news in Winnipeg, Canada on Friday, May 8, 2026.
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