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.

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.