A Legionnaires' disease cluster in the Harlem area of New York City has caused five deaths and sickened over 100 people. Here's what it is, symptoms and how it's spread.

Rainwater left untreated in cooling towers atop city-owned Harlem Hospital fueled the Big Apple’s deadliest Legionnaire’s disease outbreak in a decade, the Rev. Al Sharpton charged Tuesday.

NEW YORK -- A fifth person has died in connection with a Legionnaires’ disease outbreak in New York City, health officials said. The outbreak in Central Harlem has sickened dozens since it began in late July and the latest death was announced late Monday night. Fourteen people were hospitalized as of Monday, according to the health department.

Health officials in New York City say an outbreak of Legionnaires’ disease in Central Harlem has grown to 90 cases, including three deaths.

Lawsuit filed after a deadly Legionnaires' outbreak in Harlem, alleging negligence by construction firms and NYC.