Cardiology Quiz #36: Bacterial Endocarditis

1. A 45-year-old man with a history of intravenous drug use presents with fever, weight loss, and a new heart murmur. Blood cultures grow Gram-positive cocci in clusters. Echocardiography reveals vegetations on the tricuspid valve. Which of the following organisms is the most likely cause of his condition? 

Question 1 of 5

2. A 60-year-old man with a prosthetic heart valve presents with fever and a heart murmur. His blood cultures reveal Gram-positive cocci in chains. Which of the following is the most likely causative agent of his endocarditis? 

Question 2 of 5

3. A 25-year-old female with no significant medical history presents with low-grade fever, malaise, and splinter hemorrhages under her fingernails. She recently had a dental procedure. Blood cultures are positive for Gram-positive cocci. Which of the following best describes the mechanism by which her condition likely developed? 

Question 3 of 5

4. A 35-year-old woman presents with a fever, a new regurgitant murmur, and Janeway lesions on her palms and soles. Three sets of blood cultures are positive for Gram-positive cocci. Which of the following additional findings is most likely to be observed in this patient? 

Question 4 of 5

5. A 50-year-old man with a history of aortic valve replacement surgery two years ago presents with fever and night sweats. Blood cultures grow Gram-positive cocci. Echocardiography reveals a paravalvular abscess. Which of the following organisms is most likely responsible for this infection? 

Question 5 of 5


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