A 56-Year-Old Woman Comes to the Emergency Department Due to 3

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.  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) Budding yeasts forming germ tubes
C) Gram-positive cocci growing in clusters
D) Lactose-fermenting gram-negative bacilli
E) Silver stain-positive motile spirochetes
F) Single-stranded RNA virus