The survival of plague patients varies depending on the type of plague to which they belong. The four common clinical types of plague are mild, pulmonary, glandular and septic. Patients with mild plague can mostly be turned around after receiving antibacterial medication and their life expectancy is not affected. Pulmonary plague patients may die from heart failure and shock within 2-3 days if they are not treated with timely resuscitation, and they tend to have symptoms such as high cyanosis and blackish-purple skin before they die. Patients with glandular plague have rapid onset, often peaking in 2-4 days. If left untreated, the enlarged lymph nodes will rapidly septicize and break down, and die within 3-5 days due to severe toxemia, secondary pneumonia or sepsis; if treated promptly or in milder cases, recovery is possible. Patients with primary septicemic plague develop rapidly, with severe systemic toxemia, central nervous system symptoms and hemorrhage, and patients usually enter coma rapidly, and often die within 24 hours to 3 days if not rescued. Therefore, all patients with confirmed or suspected plague need to be closely isolated and treated with early intervention.