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.

Two separate lawsuits have been filed over the deadly Legionnaires' disease outbreak in Harlem. Both lawsuits claim construction companies failed to protect workers from unsafe conditions that led to the spread of the disease.

An outbreak of Legionnaires' disease in New York was "completely preventable," civil rights attorney Ben Crump says.