The New York City Health Department has confirmed that all 11 cooling towers suspected of harboring Legionella have been treated with chemicals and are now clear of posing any health threats.

A third person has died from Legionnaires’ disease, as the number of known cases continues to grow in Central Harlem, according to the New York City Health Department. The number of known cases ...

The disease is a type of pneumonia caused by the bacteria Legionella, which grow in warm water and can spread in building water systems such as showerheads.

Health officials in New York City say a Legionnaires’ disease outbreak tied to cooling towers has killed three and sickened more than 60 since late July.