The incubation period of plague varies depending on its clinical type, and it mostly strikes after 2-8 days. Plague is a type of natural epidemic infectious disease caused by Mycobacterium plague and belongs to the statutory category A infectious disease in China. The common clinical types of plague are glandular plague, septicemic plague and pneumonic plague, and the incubation period of plague is usually 2-5 days. Glandular or septicemic plague strikes in 2-7 days; primary pneumonic plague strikes in 1-3 days, or even as short as a few hours. In addition, if the infected person has been previously vaccinated against plague, the incubation period is relatively long, with the onset of the disease occurring after 9-12 days and manifesting itself as obvious chills, fever, and other symptoms of toxemia. In daily life, attention should be paid to timely extermination of rats and fleas, strict quarantine, vaccination against plague if possible, and early diagnosis of suspected plague patients at the infectious disease department of a hospital, and timely antibacterial treatment after a clear diagnosis.