Infectious disease is a general term for a large group of diseases that can be understood as diseases that are infectious and may cause epidemics under certain conditions after the pathogenic microorganisms have infected the human body. There are many pathogenic microorganisms that cause infectious diseases, including bacteria, viruses, mycoplasma, chlamydia, rickettsia, fungi, and protozoa. Infectious diseases and infectious diseases are somewhat different, as infectious diseases are a broader concept, as long as the pathogenic microorganisms cause the disease is called an infectious disease, while those that cause infection in the population are called infectious diseases. Infectious diseases have caused great disasters to human health in the course of human history, especially in China before the founding of New China, health conditions were relatively backward, and many infectious diseases caused serious harm. Especially in recent years, after the founding of New China, under effective prevention and control measures, the work has been very good progress, the corresponding infectious diseases have been well controlled, and even some infectious diseases have been eliminated.