The blood test list includes routine blood test, liver function test, A five and so on, mainly based on the routine blood white blood cell, neutrophil, lymphocyte count and so on, to initially determine whether the bacterial infection or viral infection. If the white blood cell count is elevated, and the proportion of neutrophils is mainly elevated, the possibility of bacterial infection is more likely to be considered. If the white blood cell count is normal or lowered, with a predominantly elevated lymphocyte ratio, a viral infection is more likely to be considered. However, this is not absolutely true. For example, there is a special case of bacterial infection, namely Mycobacterium pertussis infection, in which the patient has elevated white blood cells with a predominance of elevated lymphocytes. Determining whether a bacterial or viral infection is present is not based on the blood test report alone, but also on the patient’s clinical symptoms, as well as other laboratory tests, such as C-reactive protein, calcitoninogen, and blood cultures.