In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Q:  We describe a 64 - year - old man with S . faecium endocarditis in whom a six - week course of ampicillin and tobramycin , followed by additional courses of penicillin and other aminoglycosides , failed to eradicate the organism from the patient ' s mitral valve .
A: 
S . faecium