1579. Reduction of Antimicrobial Resistance among GramNegative Pathogens after Antimicrobial Stewardship in Three Tertiary Egyptian Hospitals Amani El Kholy, MD; Samia A. Girgis, MD.; Mervat A.F. Shetta, MD.; Arwa Ramadan, MD. and Dalia H. AbdElhHamid, MD.; Clinical Pathology, Cairo University Medical School, Cairo, Egypt, Faculty of Medicine, Ain Shams University, Cairo, Egypt, Clinical Pathol...