18th January 2024

A 23-year-old male presents with a very painful and swollen right knee.

A 23-year-old male presents with a very painful and swollen right knee. He has a past medical history of ulcerative colitis and eczema. He has felt non-specifically unwell since he returned from a month-long trip to Thailand a few days ago. On examination, his right knee is tender, red and hot. He has widespread eczema to the flexor surfaces of his knees and elbows. His temperature is 37.9 degrees Celsius. One of his eyes looks erythematous, and he reports that it has been painful for around a week.

Which of the following is the organism most likely to be cultured from the synovial fluid aspirate?

Select the SINGLE most appropriate option from the list below. Select ONE option only.