St. Bernard Hospital in Englewood earned the only F in the state in safety ratings released Thursday by the nonprofit Leapfrog Group, which grades hospitals twice a year. Five Illinois hospitals earned D grades, including Chicago’s Stroger Hospital and University of Illinois Hospital, Advocate South Suburban Hospital in Hazel Crest, Vista Medical Center East in Waukegan, and Gateway Regional Medical Center in Granite City. Many of those hospitals serve high numbers of low-income patients.