SARS not only brought a large-scale outbreak of infectious diseases to human beings, but also sounded the alarm for preventing and treating new and more serious infectious diseases than before. With the continuous progress of antibiotic research and development, we are optimistic that those ancient infectious diseases have been controlled, and even some diseases have been declared "extinct". But in recent years, around the world? Some current epidemics have ruthlessly shattered the human dream. Those malignant infectious diseases that have accompanied mankind for millions of years have not completely disappeared. They are still hiding in a corner of the world, and when the conditions are ripe, they will jump out and make waves. Moreover, it is not only the recurrence of these old germs, but also the emergence of new viruses, and the virus that caused SARS is one of them.