IQR: interquartile range, SBI: serious bacterial infection, CRP: C-reactive protein, RDW: red cell distribution width, ANC: absolute neutrophil count, NLR: neutrophil-to-lymphocyte ratio, LMR: lymphocyte-to-monocyte ratio, PLT/MPV: platelet-to-mean platelet volume ratio, PLR: platelet-to-lymphocyte ratio. The gene discussed is CRP; the disease is bacterial infectious disease.