Legionnaires' disease is a type of pneumonia caused by bacteria that grows in warm water. It has infected 67 people in a growing cluster of disease in New York.

Public health officials in London, Ont., have declared that an outbreak of legionnaires' disease is over, but a search for the source of the bacteria continues after three people died and dozens were hospitalized over the course of a month.

A third person has died in connection with the ongoing Legionnaires’ disease outbreak in London and surrounding Middlesex County, according to just-updated figures from local public health officials.