CRP and hepatitis A virus infection: A broad workup for infectious and autoimmune causes was unremarkable, including negative Lyme, rapid plasma reagin (RPR), antinuclear antibody (ANA), antineutrophil cytoplasmic antibodies (ANCA), and hepatitis panels, with mild C-reactive protein (CRP) elevation (7.5 mg/L) and normal erythrocyte sedimentation rate (ESR).