Three people have died and at least 67 people have been diagnosed with Legionnaires’ disease in a cluster that broke out in New York City last week.

The deadly Legionnaires' disease outbreak in Harlem continues to spread, forcing residents to be hyper-vigilant and on the look-out for the flu-like symptoms associated with the illness.

A Legionnaires' disease cluster in the Harlem area of New York City has caused three deaths and 5over 60 people to be sickened. Here's what it is, symptoms and how it's spread.