19th January 2024

A 25-year-old male presents to ED with a 2-day history of fever, right knee pain and swelling, and urethral discharge.

A 25-year-old male presents to ED with a 2-day history of fever, right knee pain and swelling, and urethral discharge. He recently went on holiday to Thailand 2 weeks ago, and, on further questioning, admits to having unprotected sexual intercourse with a female. He is suspected of having reactive arthritis. 

What is the most common causative organism?

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