A 56-year-old woman comes to the emergency department due to 3 days of fever, chills, and retrosternal chest pain. She has end-stage kidney disease related to previous uncontrolled hypertension and receives intermittent hemodialysis through a tunneled catheter. Temperature is 39°C (102.2°F), blood pressure is 108/64 mm Hg, and pulse is 120/min. The patient is ill-appearing. The lungs are clear to auscultation, but a pericardial friction rub is present. Echocardiography reveals a moderate-sized pericardial effusion. Pericardiocentesis yields turbid fluid with a large number of neutrophils and a bacteria that is coagulase positive. Microbiologic analysis of this patient's pericardial fluid is most likely to reveal which of the following pathogens?
A. Bacilli with acid-fast cell walls
B. Silver stain-positive motile spirochetes
C. Budding yeasts forming germ tubes
D. Single-stranded RNA virus
E. Lactose-fermenting gram-negative bacilli
F. Gram-positive cocci growing in clusters