UKMLA PLAB AMC USMLE Prometric MCQ

Question Number 0822

Question:
A 18 year old intravenous drug user has the sudden onset of fever and chills. She has pain in her right knee. Movement of her knee causes pain. She adamantly denies any trauma to her knee. On physical examination, her knee is red and warm. Laboratory blood work is done. Her white blood count is 15,000 cu/mm, rheumatoid factor is negative, uric acid is within normal limits. An aspiration of his knee joint is also done, but unfortunately, the lab results got lost. What is a likely diagnosis?

a) rheumatoid arthritis
b) osteoarthritis
c) suppurative arthritis
d) gout
e) ankylosing spondylitis