A legionnaires’ disease outbreak has been “re-declared” after a sudden rash of 25 new cases but officials now say they believe they’ve pinpointed the source of the outbreak.

“To date, the outbreak in 2025 has been linked to serious pneumonia in at least 94 London residents, resulting in 86 hospitalizations and four deaths,” the Middlesex-London Health Unit said Tuesday.

“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.”

The outbreak, first confirmed in early July , had previously been declared over on Aug. 6.

A spokesperson for the health unit said nine cooling towers (air-conditioning units from large buildings) across the

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