A 55-year-old Asian man with mitral stenosis secondary to rheumatic heart disease undergoes dental surgery for caries. Postoperatively, he does well and is discharged home. Two weeks later, he presents with fever, chills, fatigue, and feels “sick.” Four out of four blood culture bottles are positive for gram-positive cocci. An echocardiogram is performed and shows mitral valve vegetations. Which of the following is the most likely causative organism of this patient’s condition?
A. Groupe B streptococci
B. Streptococcus mutans
C. Streptococci bovis
D. Staphylococcus epidermis
E. Enterococci