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134795 Pathology

A 10-year-old girl develops subcutaneous nodules over the skin of her arms and torso 3 weeks after a bout of acute pharyngitis. She manifests choreiform movements and begins to complain of pain in her knees and hips, particularly with movement. A friction rub is heard on auscultation of her chest. An abnormality detected by which of the following serum laboratory findings is most characteristic of the disease affecting this girl?

AAnti-streptolysin O antibody titer
BAntinuclear antibody titer
CCreatinine level
DRapid plasma reagin test
Pathology
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