A 62-year-old male has had an aortic valve replacement.
He presents 5 months after surgery with malaise, anorexia and low-grade
fever. On examination he has splinter haemorrhages in his nails, there are
tender nodules on the pulps of his fingers and erythematous macules over his
palms. His spleen is just palpable.
You arrange for blood cultures to be taken on this
Which of the following is the most likely infecting