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.

A pair of construction companies overlooked safety concerns, causing a “completely preventable” outbreak of Legionnaires’ disease in New York City that's killed at least five people and sickened dozens more,