Legionnaires' disease outbreak in US: New York City health officials are investigating a Legionnaires' disease outbreak on Manhattan's Upper East Side, with 18 confirmed cases. The source is believed to be a contaminated cooling tower, not the public water supply. Residents in affected ZIP codes are urged to monitor for flu-like symptoms such as fever, cough, and shortness of breath, and seek medical attention if unwell. Early diagnosis and treatment are crucial for recovery.

An outbreak of Legionnaire's disease on New York City's Upper East Side has jumped to 14 confirmed cases, health officials said Sunday.

Here's everything to know about the Legionnaires' disease cluster being reported in NYC's Upper East Side.