A New Jersey hospital is warning hundreds of patients to be on the lookout for symptoms of Legionnaires’ disease after a patient death led to the discovery of the potentially deadly bacteria in the facility’s water system.

The patient, whose identity was not released, was treated in July at St. Joseph’s University Medical Center in Paterson for multiple medical conditions. The patient also tested positive for Legionella, a type of bacteria that can cause a serious form of pneumonia, according to a statement from St. Joseph’s Health , which owns the hospital.

“We have been working closely with state and local health officials after a patient was treated for multiple medical conditions and also tested positive for Legionella,” Dr. Joseph Duffy, chief medical officer of St. Joseph’s,

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