As for radiographic and laboratory findings on admission, abnormal chest X-ray (with signs of pneumonia or other abnormalities), abnormal WBCs (WBC count < 5.0*10^9/L or > 12*10^9/L), hypoalbuminemia (ALB < 35 g/L), elevated CRP (CRP > 6 mg/L), proteinuria, and positive on RSV detection were significant predictors of increased risk of severe CAP or ICU admission (P <  0.01). The gene discussed is CRP; the disease is susceptibility to pneumonia measurement.