A 65-Year-Old Man Who Underwent Right Total Knee Replacement 6

A 65-year-old man who underwent right total knee replacement 6 months ago comes to the emergency department due to a 3-week history of dull pain in his right knee.  He has had no recent respiratory illness, diarrhea, or urinary symptoms.  Medical history is notable for osteoarthritis, hypertension, and hyperlipidemia.  The patient drinks a beer every night and does not use tobacco or illicit drugs.  Temperature is 37.3 C (99.1 F) , blood pressure is 120/60 mm Hg, and pulse is 90/min.  Examination shows mild swelling and tenderness at the knee with full range of motion.  The skin over the joint is intact.  The synovial fluid is sampled.  Laboratory results are as follows: Which of the following is the most likely cause of this patient's current condition?

A) Atypical mycobacteria
B) Borrelia burgdorferi
C) Chlamydia trachomatis
D) Neisseria gonorrhoeae
E) Pseudomonas aeruginosa
F) Salmonella species
G) Staphylococcus aureus
H) Staphylococcus epidermidis

Correct Answer:

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