The incubation period of pulmonary anthrax is the time between the entry of Bacillus anthracis cells into the lungs through the respiratory tract and the earliest appearance of clinical symptoms in the patient. The incubation period of pulmonary anthrax is usually one to five days, followed by low-grade fever, chest tightness and other symptoms. Pulmonary anthrax is highly contagious, and the onset of the disease is very sudden and urgent, and the probability of death is relatively high. Symptoms such as respiratory distress or coughing up blood may occur, and a small percentage of people may get anthrax meningitis. Pneumoconiosis can be contracted through direct contact with diseased livestock or by eating meat or products made from diseased livestock, so it is important to take precautions in general, especially for those at high risk.