Humoral immunity, complement, C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) results were also normal; anti-nuclear antibody (ANA), extractable nuclear antibody (ENA), five indicators (HBsAg, HBsAb, HBeAg, HBeAb, HBcAb) of hepatitis B, three indicators (anti-HCV, anti-HIV, anti-TP) of infectious diseases and Mycobacterium tuberculosis antibody were negative. This evidence concerns the gene CRP and infectious disease.