Relative to patients in good outcome group after aSAH, those in poor outcome group presented higher baseline Hunt and Hess grade (P < 0.001), higher modified fisher score (P < 0.001), higher WFNS score on admission (P < 0.001), higher proportions of infection (P = 0.009), higher WBC (P = 0.018), higher CRP (P = 0.011), higher IL-6 (P < 0.001), as well as higher SAA (P < 0.001). The gene discussed is IL6; the disease is infection.