Review Question - QID 210463

A 41-year-old woman presents to the emergency room with a fever. She has had intermittent fevers accompanied by malaise, weakness, and mild shortness of breath for the past 2 weeks. Her past medical history is notable for recurrent bloody diarrhea for over 3 years. She underwent a flexible sigmoidosopy several months ago which demonstrated contiguously granular and hyperemic rectal mucosa. She has a distant history of intravenous drug use but has been sober for the past 15 years. Her temperature is 100.8°F (38.2°C), blood pressure is 126/76 mmHg, pulse is 112/min, and respirations are 17/min. On exam, she appears lethargic but is able to answer questions appropriately. A new systolic II/VI murmur is heard on cardiac auscultation. Subungual hemorrhages are noted. Multiple blood cultures are drawn and results are pending. Which of the following pathogens is most strongly associated with this patient's condition?