University Hospital opened as Hôtel-Dieu in 1859 and was operated by the Daughters of Charity. In 1913, it was the first hospital in the United States to have air conditioning in its surgical suites, and it was the site of milestone medical research that developed sulfonamide drug treatment for meningitis in the 1940s. The hospital developed a relationship with LSU Health Sciences Center in the 1970s and 1980s. It was purchased by the Louisiana State University System in 1991, renamed and converted into a teaching hospital for the adjacent medical school, which it also oversaw. Like its sister hospital, Charity Hospital, University Hospital sustained severe flood damage during Hurricane Katrina, and its patients were evacuated by boat and helicopter after the storm. In addition to the flood damage to the structure itself, the significant flooding caused the emergency generators to become submerged, eventually becoming inundated with floodwater and failing. Another substantial impact caused by the overwhelming flood waters was the devastation to the sewage system. As those employed by the hospital attempted to successfully care for patients while dealing with limited supplies and manpower, the sewage system eventually failed, exposing all occupants of the hospital to potential diseases and illnesses. However, the hospital was extensively renovated and reopened November 20, 2006. Although staff shortages and other limitations originally only allowed for a capacity of 85 out of 575 beds, the reopening was seen by many as a turning point for New Orleans, having had a severe shortage of emergency care since Katrina. In October 2009, University, with the closure of Charity Hospital, was designated the city's new Level I trauma center, named "Spirit of Charity", and alleviated West Jefferson Medical Center and East Jefferson General Hospital, which had been serving as the trauma centers up until then. As of 2014 the hospital is operating at 235 staffed beds. The successor of Charity Hospital following Hurricane Katrina, Interim LSU Hospital was the main teaching hospital for LSU Health Sciences Center and was the only hospital in south Louisiana certified as a Level I Trauma Center by the American College of Surgeons. Interim LSU Hospital was closed on August 1st, 2015, with all patients and services being moved to the newly-built University Medical Center New Orleans.