Furthermore, a recent meta-analysis has revealed that CRP is a more reliable marker for mortality-AUC = 0.8, along with leukocytosis-AUC = 0.77, and procalcitonin (PCT)-AUC = 0.77 [52], although Nouvenne et al. [53] proved that CRP is a more accurate marker for predicting the diagnosis of pneumonia, while PCT is more specific for bacteremia with identification of bacterial species and differential diagnosis between bacterial vs. nonbacterial infections. The gene discussed is CRP; the disease is susceptibility to pneumonia measurement.