18th January 2024

A 40-year-old female with a past medical history of Rheumatoid Arthritis presents to the Emergency Department with a 1-day history of feeling feverish.

A 40-year-old female with a past medical history of Rheumatoid Arthritis presents to the Emergency Department with a 1-day history of feeling feverish. On examination, her left knee is swollen, red and hot. She has limited flexion in the knee and is struggling to weight-bear. She has no other swollen joints. She reports that she has had knee swelling previously, but it has always been bilateral and never this severe.

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

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