Check out today’s Step 1 Qmax Question Challenge.
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A 25-year-old man presents to the clinic because of fever, lymphadenopathy, and a macular rash over his trunk and extremities that extends to his palms and soles. Three weeks ago, he noticed a painless “bump” on his penis that self-resolved. Serologic testing is positive for antibodies against a nonspecific antigen, and further specific testing confirms the diagnosis.
Where is the endogenous, non-specific antigen targeted by this patient’s immune response found?
A. Bile phospholipids
B. Inner mitochondrial membrane
C. Myelin
D. RBC membranes
E. Surfactant
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