MRCP2-2601

A 45-year-old businesswoman recently returned from a four-day trip to Mexico for work. She began experiencing symptoms five days after returning to the United Kingdom, including fever, headache, eye pain, back pain, and severe muscle pain. She also developed a rash that started on her trunk and spread to her extremities and face. Upon examination, she appeared ill and had a temperature of 38°C and blood pressure of 120/70 mmHg. She had swollen adenoids with palatal vesicles and a maculopapular rash all over her body. What diagnostic tests would you recommend to confirm the diagnosis?