8th July 2023

A 26-year-old female orienteering enthusiast presents with malaise, arthralgia and fever

A 26-year-old female orienteering enthusiast presents with malaise, arthralgia and fever. On systemic enquiry, she describes having a target-like lesion on her right leg first noticed 4 weeks ago, but this has now disappeared. She does not recall any insect or tick bites. You suspect Lyme disease. What is the most appropriate initial test in this patient given your suspicion?

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