Legionnaires' disease has been in the headlines on both sides of the border this summer, with public health officials investigating outbreaks in Ontario and in neighbouring New York state.

An July outbreak in London, Ont., which has since been declared over , left three people dead and 70 infected. The source of the outbreak is not yet known .

A recent outbreak in New York City, meanwhile, has killed three people and sickened more than five dozen since late July.

Health officials in that city link the Central Harlem outbreak to cooling towers — structures containing water and a fan that are used to cool buildings. They said 11 of these towers initially tested positive for a type of bacteria that causes legionnaires' disease but the problem has been remedied. WATCH | A legionnair

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