A bacteria known to cause Legionnaires' disease was found at the University Hospital of Brooklyn, according to multiple tests.

The Prospect Lefferts Garden hospital, which is part of the SUNY Downstate campus, says that testing revealed a high percentage of legionella pneumophila in the building's water.

The hospital announced that staff and patients will only use bottled water for drinking and brushing their teeth.

They added in a statement, "While we understand that these actions may cause concern, we want to assure the UHB community that we are taking all appropriate actions to address the matter. It's important to stress that Legionnaires’ disease is not spread from person-to-person."

SUNY Downstate also released a statement on Friday announcing water restrictions for patients and staff.

People who are 50 and older, smokers, those with chronic lung diseases or weakened immune systems are most at risk of getting Legionnaires' disease.

The hospital says it is open and safe for patients, staff and visitors.