The plague virus can usually survive for about 3~7 days after leaving a living body. Plague virus has a certain degree of contagiousness, contact with the patient’s sputum, pus, blood and body tissues, it is easy to be infected, and also through the respiratory droplet transmission, but the plague virus after leaving the living body survival time is generally not particularly long, about 3 to 7 days. Plague is a virulent infectious disease caused by infection with Yersinia pestis, which is mainly prevalent in rats, dry otters and other rodents, and belongs to the natural epidemic disease. After infection, the patient will have a sudden high fever, and the body temperature will reach 39 ℃ to 41 ℃, accompanied by severe headache, shortness of breath and tachycardia, and in serious cases, the patient will also have a drop in blood pressure and blurred consciousness. Usually must be far away from the plague endemic areas, to avoid infection, life and health threatening.