Infection refers to local tissue and systemic inflammatory reactions caused by pathogens such as bacteria, viruses, and mycoplasma invading the human body. Infectious diseases seriously endanger people's health, especially children's infectious diseases, which is the most important cause of morbidity and mortality in children under 5 years old. Respiratory tract infections account for the first time in the incidence of pediatric diseases, accounting for 90% of the total number of pediatric outpatients. In adult pneumonia, bacterial infections account for 80%, patients with 2.5 million per year, and annual mortality rate of 5%. Therefore, clinically, The requirement for the infection test kit is to judge whether the patient's symptoms are caused by a virus or a bacterium in a short period of time, thereby prescribing the drug and avoiding the abuse of antibiotics.