29th July 2023

A 51 year old returns from hiking in rural Australia with a 1 week history of fever, lethargy, and polyarthralgia.

A 51 year old returns from hiking in rural Australia with a 1 week history of fever, lethargy, and polyarthralgia. He also has a widespread maculopapular rash. An eschar is noted on his lower leg. A blood smear is negative, and liver and renal function is normal.

What is the most likely diagnosis?

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