A 55-year-old immigrant from France without known history of IV drug use or structural heart disease presents with the signs and symptoms of infective endocarditis. You isolate an unusual organism, a Gram positive coccus susceptible to penicillin that is non-hemolytic on blood agar. It grows in 40% bile but not 6.5% NaCl and hydrolyzes esculin but not arginine.
Your attending tells you to do a colonoscopy.
Challenge: What is the organism? Why the colonoscopy?