All laboratory test results were within normal ranges, including C-reactive protein (CRP), complete blood count with differential, erythrocyte sedimentation rate (ESR), liver and kidney function tests, complement testing, anti-streptolysin O (ASO) titer, T-SPOT assay for tuberculosis infection, hepatitis serology markers, as well as autoimmune antibody screening (ANA, anti-dsDNA, anti-Smith, anti-SSA, anti-SSB, anti-Scl-70, anti-Jo-1, anti-histone, and anti-nucleosome) and rheumatoid factor. The gene discussed is CRP; the disease is hepatitis A virus infection.