Toronto Public Health has confirmed nine cases of Legionnaires' disease in the southeast area of the city, prompting an investigation into a possible common source. The cases were identified in late March and early April, and health officials believe they may be linked due to their close proximity in time and location.
In a statement to the Toronto Sun, the health unit noted that the threat to the public remains low, but the investigation is ongoing. No source has been identified yet, and officials are inspecting the area for potential exposures, collecting samples from possible sources, and collaborating with city divisions, local public health units, and provincial and federal partners.
What to Know About Legionnaires' Disease
Legionnaires' disease is caused by the Legionella bacteria, which is found in water droplets. It cannot be spread from person to person. The illness can lead to pneumonia or flu-like symptoms, including fever, chills, headaches, and muscle or abdominal pain within two weeks of exposure.
While the bacteria occur naturally in water sources, infections are typically linked to poorly maintained water systems in spas, health-care facilities, commercial buildings, and cruise ships. According to Health Canada, the severity can range from mild to severe, and in some cases, symptoms can progress quickly to organ failure and death.
Older adults, smokers, and people with underlying health conditions are at higher risk for severe symptoms and may require treatment with antibiotics.
Historical Context: 2005 Outbreak
In September 2005, a Legionnaires' outbreak at a Scarborough long-term care facility resulted in 23 deaths and over 100 infections. That outbreak at Seven Oaks affected 135 people, including residents, staff, visitors, and nearby residents. The cause was unknown for the first 10 days.
Toronto Public Health continues to monitor the current situation and will provide updates as the investigation progresses.
