Officials have contacted Beth Israel Deaconess Hospital where the person had been a patient and are dictating infection control measures that must be implemented at the facility, a DPH official said Friday.

Massachusetts health officials are investigating a Legionnaires' disease case at Beth Israel Deaconess Hospital.

Legionnaires’ disease is a serious form of pneumonia that is caused by the Legionella bacteria, a water-borne organism found naturally in the environment and not transmitted person-to-person.

Dr. Todd Ellerin discusses Legionnaires' disease and the recent discovery of a case within Beth Israel Deaconess Hospital in Needham.