Plague has a rapid onset and a relatively short incubation period of about 2-5 days, which can be characterized by high fever, general malaise, vomiting, diarrhea, respiratory and circulatory failure, etc. The plague, commonly known as the Black Death, is highly contagious, has a rapid onset and a high death rate, and is a Class A infectious disease in China. Generally, symptoms appear within 2-5 days after infection with plague, with an average of about 3 days, with pneumonic plague having a slightly shorter incubation period, with most developing within 3 days. In addition, if a patient who has been vaccinated against plague is re-infected with plague, the incubation period is relatively long, about 9-12 days. Plague is a virulent infectious disease, and once diagnosed, you must cooperate with your doctor for isolation and treatment, and must not go out at will to avoid an outbreak of plague.