27th June 2023

A 32-year-old male presents with a painful ulcer on his penis. He has associated swelling of the right inguinal lymph nodes

A 32-year-old male presents with a painful ulcer on his penis. He has associated swelling of the right inguinal lymph nodes, 2 of which are particularly painful and discharging pus. He has recently returned from a 6-month trip to South Africa, where he had multiple sexual partners. He is systemically well.

What is the most likely causative organism?

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