MLHU redeclares Legionnaires’ outbreak in London, Ont., source identified – CTV
August 26, 2025
After 25 additional cases of Legionnaires’ Disease were reported in London, Ont. the Middlesex-London Health Unit (MLHU) is redeclaring an outbreak, and the likely source has been confirmed.
“The decision to reopen the outbreak reflects a rise in cases after several weeks without new cases, suggesting that the Legionella bacteria has re-emerged in the environment despite earlier remediation efforts,” read a statement from the health unit.
During extensive case investigations, environmental sampling and collaboration with building operators, the health unit said multiple cooling towers at nine separate locations in London tested positive for live Legionella bacteria.
“Results from further testing at Sofina Foods Inc. were found to match the subtype linked to the outbreak,” said the health unit.
Despite routine cleaning and disinfection, the health unit added that trace bacteria can sometimes persist in cooling towers and regrow under hot, humid conditions.
Read more: https://www.ctvnews.ca/london/article/mlhu-redeclares-legionnaires-outbreak-in-london-ont/
