Two people have died and more than 50 others have reported illness from a Legionnaires' disease cluster in New York City. Known for causing sickness in confined areas and places that share water systems, Legionnaires' has been known to cause mass illness in hotels, hospitals, prisons and housing blocks.

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.

A Legionnaires' disease cluster in New York has left two people dead and sickened over 50 others. Here's what California residents should know.