Why do we care about antibiotic resistant organisms like this one? When you see gram-positive cocci in pairs/chains and bile esculin is positive, you’re deciding between Enterococcus and Group D strep, and that’s a clinically important distinction. Here’s the bench breakdown: Catalase: Negative (as expected for Strep/Enterococcus) PYR: Positive = Enterococcus Negative = Group D Strep (ex. S. gallolyticus) 6.5% NaCl (Salt tolerance): Growth = Enterococcus No growth = Group D Strep Both are bile e