Among them, the C-reactive protein (CRP) in serum is a known biomarker of systemic inflammation and has been studied as a predictor of cardiovascular diseases [18,19], and there has been a growing need for CRP-POCT to discern infectious diseases and other inflammatory disorders, which could lead to a reduction in the unnecessary use of antibiotics for treating respiratory tract infections [20]. This evidence concerns the gene CRP and Respiratory tract infection.