CRP and bacterial infectious disease: There is a slight increase in viral infection and a significant increase in bacterial infection in CRP, however it is difficult to discern whether a single small increase in CRP indicates a viral or bacterial infection(mild infection).[9,10]The ratio combination of the above indicators can eliminate individual variation and instability and reflect the equilibrium between the inflammatory response and immune status of the body, given that for a single indicator, as described above, there are significant variations and fluctuations among individuals, which are subject to numerous factors.