Compared to those who survived beyond 30 days, non-survivors were older; more likely to also have CHF, COPD, hypoalbuminemia, thrombocytopenia, hyponatremia, low T3 syndrome, and septic shock; and showed a higher C reactive protein (CRP) level, a higher blood urea nitrogen (BUN) level, lower arterial pH, and higher prevalence of severe CAP (SCAP, PSI risk class ≥ IV or CURB-65 score ≥2 or eligible for SCAP criteria; P < 0.05). The gene discussed is CRP; the disease is Hyponatremia.