2nd August 2023

You review a 25-year-old man with a 2-day history of fever, chills, headache, and myalgia who has enjoyed wild swimming

You review a 25-year-old man with a 2-day history of fever, chills, headache, and myalgia who has enjoyed wild swimming in recent years in a lake surrounded by animal farmland. Blood cultures and microscopy demonstrate a gram-negative spirochete. After a 7-day course of doxycycline BD, the patient makes a full recovery.

What is the causative pathogen?

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