183. Evaluating Multidrug Resistance Prevalence and Antimicrobial Stewardship Preparedness in the Largest Not-For-Profit Healthcare System in the United States: Taking the First Step to Optimize Antimicrobial Use Roy Guharoy, PharmD, MBAS; Mohamad G. Fakih, MD, MPH; Gail Fraine, RN; Michelle Heavens, BSN, MHA; Ann Hendrich, RN, PhD; Medicine, University of Massachusetts Medical School, Worceste...