A Legionnaires' disease outbreak in Harlem is blamed for at least two deaths, and NYC officials are warning to watch out for the symptoms.

The New York City Legionnaires' disease outbreak in Central Harlem is growing. Is it contagious? How do you get it? What Kentucky needs to know.

Legionnaires' disease is caused by Legionella, a bacteria that can travel through water systems and devices. Although most healthy people don't contract it, it can be deadly for those who do.