1 dead, over 40 sick as legionnaires’ outbreak spreads in southeast London, Ont. – CBC

Health officials haven’t yet determined source of 2nd outbreak of the respiratory illness in the last year

Jul 08, 2025

One person is dead and more than 40 people have become ill in an outbreak of legionnaires’ disease in London, Ont.

The Middlesex-London Health Unit, which declared the outbreak, said the cases were reported within the last week. Most of the people with the severe respiratory illness live and/or work within a six-kilometre radius of one another, in the southeast side of the city, officials said.

On Tuesday, officials said the health unit is working closely with Public Health Ontario and the Public Health Ontario Laboratories to investigate and try to determine the source of the outbreak, adding the investigation may take time as they need to do environmental samples of many types of cooling systems.

“I know that is what most people are anxious to understand, is where it is coming from, and so are we. Unfortunately, we don’t yet have a location,” said Dr. Joanne Kearon, the health unit’s associate medical officer of health.

Read more: https://www.cbc.ca/news/canada/london/legionnaires-disease-london-ontario-1.7579609