The Legionnaires' disease outbreak in Central Harlem has been traced to 12 cooling towers, including several at city-owned and operated buildings like Harlem Hospital, officials said Thursday.

Harlem Hospital is one of several locations where people were exposed to Legionnaires’ disease since the outbreak in Central Harlem, officials said Thursday. The spread began in Central Harlem on July 25 with five reported cases of the disease.

A cooling tower at Harlem Hospital was among 12 sites tied to the city’s Legionnaires’ disease outbreak that’s now killed four people and sickened nearly 100, Department of Health officials