A Legionnaires' disease cluster in the Harlem area of New York City has caused six deaths and sickened over 110 people. Here's what it is, symptoms and how it's spread.

New York City officials have discovered a sixth death linked to a Legionnaires' disease outbreak in Central Harlem, where more than 100 people have been diagnosed with the ailment, health authorities said Thursday.

Six people have now died from a Legionnaires’ disease outbreak in New York City’s Central Harlem, and another seven are currently hospitalized with the condition, the city’s health department said.