17th February 2025

A 45-year-old lady is admitted to hospital with a two-week prodrome of a dry cough, fatigue and headache.

A 45-year-old lady is admitted to hospital with a two-week prodrome of a dry cough, fatigue and headache. The patient also complains of joint pain and, on examination, has multiple target-shaped lesions on her arm. What investigation is most likely to be diagnostic for this organism?

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