New Brunswick, NJ-based St. Peter's University Hospital has reported that an eighth patient has tested positive for the bacteria that causes Legionnaires' disease. Hospital officials said in a statement that the latest patient was released from St. Peter's on Aug. 30. Hospital officials say a drop in the level of chlorine in the water system likely caused the outbreak. Eight patients have now tested positive, and two have died, in the Legionnaires' disease outbreak.