CRP and bacterial infectious disease: Among classic biomarkers, a decrease in peripheral blood leukocyte count has a higher specificity but lower sensitivity in diagnosing neonatal sepsis [12], a decrease in neutrophil count is more sensitive to diagnosing neonatal sepsis but is more susceptible to factors such as delivery route and gestational age [13], a decrease in platelet count alone has insufficient sensitivity and specificity in diagnosing neonatal sepsis [14], C-reactive protein (CRP) and procalcitonin (PCT) it is of great significance in the diagnosis of bacterial infectious diseases [15].