Infectious Disease Q85

A 22-year-old man is evaluated in the emergency department for a 2-day history of painful rash on the left side of his posterior chest. Medical history is unremarkable, and he takes no medications. On physical examination, temperature is 37.5 °C (99.5 °F), blood pressure is 115/62 mm Hg, pulse rate is 78/min, and respiration rate is 20/min. A vesicular rash is shown.

Which of the following is the most appropriate test to perform next?

A CH50 activity

B Fourth generation HIV-1/2 antigen/antibody combination immunoassay

C IgA measurement

D Quantitative immunoglobulin measurement

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