Recently, after reviewing 31 studies of 23 biomarkers, a meta-analysis of the ability of biomarkers to identify bacterial pneumonia concluded that although serum CRP and procalcitonin (PCT) perform better than white blood cell count or erythrocyte sedimentation rate, the sensitivity and specificity of these markers are between 60% and 70%, which is still unsatisfactory [23]. The gene discussed is CRP; the disease is bacterial pneumonia.