The outbreak has been traced to 12 cooling towers, including four city-run buildings, like Harlem Hospital, officials said.

Health officials in New York City say a cluster of Legionnaires’ disease in Central Harlem has grown to 99 cases, including four deaths .

“Why weren’t these cooling towers properly maintained? Who dropped the ball and why?” raged Nichole Ingram, who fell ill with Legionnaires’ disease around July 24 after she attended a funeral service...