An outbreak of Legionnaires’ disease in New York City has killed three people and sickened 70 since it was first detected in late July.

City health officials link the Harlem outbreak to cooling towers , structures containing water and a fan that are used to cool buildings. All cooling towers operating in the impacted area have been sampled, and the Health Department has told owners of buildings where positive results were found to initiate remediation within a day.

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They urged people in the area with flu-like symptoms to contact a health care provider as soon as possible, especially if they are 50 or older, smoke or have chronic lung conditions.

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