An outbreak of legionnaires' disease, a serious respiratory illness, in London, Ont., has killed one person and made more than 35 people sick. Health officials do not know where the outbreak started or where it’s spreading.

Ontario

A Legionnaires' disease outbreak in London, Ontario has led to one fatality and more than 35 confirmed cases, significantly exceeding the typical monthly average for the area. The outbreak is concentrated in the southeast part of the city, the same area affected by a similar incident last year, but health officials have yet to determine the source of the infection.

Legionnaires' disease is caused by bacteria that thrive in warm, stagnant water, often found in cooling towers of large buildings. While the illness is not contagious and can be treated with antibiotics if caught early, those over 40, smokers, and individuals with chronic illnesses or weakened immune systems are at higher risk of severe symptoms. Authorities are inspecting cooling towers in affected areas, but warn that the investigation may take time.

Legionnaires' disease outbreak kills 1, leaves dozens ill

London, Ontario is now grappling with a deadly outbreak of Legionnaire's disease. Officials confirm one person has now died. We are seeing cases in excess more than we would typically expect. We typically expect one to two a month. In the past week we've identified over 35 cases. The outbreak of the respiratory illness is in the city's southeast. The same area where there was another deadly outbreak last summer. But health officials still don't know how people are getting infected. Legionnaire's disease is caused by bacteria that can grow in warm still water. Often in cooling towers which remove heat from large buildings. When contaminated water vaporizes and people breathe it in they can get sick. For most it's a mild illness. We are talking about the people who have developed a pneumonia and become quite ill so they have a fever, cough and have developed shortness of breath. Symptoms start within 2 to 14 days of infection. But it's not contagious and if caught early it is treatable. Antibiotics used for severe pneumonias in hospital would cover this pathogen. Those at higher risk of serious illness include people who are older than 40 years old, smoke, have a chronic illness or a weak immune system. They've been long-term smokers, they've got damage to their lungs already and on top of that now they've got Legionnaire's disease. That makes their oxygen levels drop fairly quickly. Since 2018 Canada has had about 500 to 700 cases each year. Though health experts say the illness is likely underreported. You need to address it quick. One expert in the water treatment industry says there's calls to better enforce cooling tower inspections. Doing tests more often that's what they bring you to be more proactive. The public health unit in London, Ontario is sending people out to cooling towers of buildings where many of the cases are located. But caution the investigation could take some time. Jennifer Lagrassa, CBC News, Toronto.

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Breakdown