An otherwise healthy patient who has just received a prosthetic aortic valve develops postoperative fever. Blood cultures are done and she is placed on broad-spectrum antibiotics. Two days later she is still febrile and clinically deteriorating. Which of the following organisms is the most probable etiologic agent?
ANocardia asteroides
BActinomyces israelii
CHistoplasma capsulatum
DCandida albicans
What is the Hib conjugate vaccine made of?
ACapsular polysaccharide
BPurified protein with carrier
CCell wall polysaccharide
DCapsular polysaccharide with carrier
A 6-year-old boy presents with fever and chills, cough, rapid breathing, difficulty breathing, and chest pain. A culture from a respiratory sample shows Gram-positive bacteria. What is the most likely organism causing this infection?
AStreptococcus pyogenes
BStreptococcus pneumoniae
CStaphylococcus aureus
DPropionibacterium acnes
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