In comparison, the composition ratio of bacterial, fungal, viral, and mycobacterial infections in anti-IFN-γ IgG-negative SLE patients were 37.3% (p = 0.448), 15.6% (p = 0.089), 47% (p = 0.369), and 0% (p = 0.006), respectively. The gene discussed is IFNG; the disease is systemic lupus erythematosus.