Hamilton Investigates 13 Legionnaires' Cases

Hamilton Public Health officials are investigating a cluster of 13 confirmed cases of legionellosis, commonly known as Legionnaires' disease, reported in the east end of Hamilton and Stoney Creek since Monday.

The agency has notified local hospitals to monitor for additional potential cases as it works to pinpoint sources of exposure. No common source has been identified so far, but investigators are focusing on possible origins such as nearby cooling towers. Legionnaires' disease, caused by legionella bacteria thriving in warm water environments, spreads when people inhale small water droplets containing the pathogen. It does not transmit from person to person.

"We have identified a cluster of legionellosis cases in the east end of the city and are focused on identifying potential sources of exposure," said Dr. Brendan Lew, associate medical officer of health for Hamilton. "We are working closely with local partners and reminding residents and facility operators of the importance of properly maintaining water systems and mist-producing devices."

The infection can develop into pneumonia, with symptoms including high fever and chills. It primarily affects people aged 50 and older,...