SARS, also known as infectious atypical pneumonia and severe acute respiratory syndrome, is an acute respiratory infectious disease caused by the SARS coronavirus, which is mainly transmitted through short-distance droplets, contact with respiratory secretions of patients, and close contact. Fever, headache, muscle aches, fatigue, dry cough, little sputum, diarrhea as the main clinical manifestations, severe cases may appear shortness of breath or respiratory distress.SARS coronavirus is a virus originating from animals, due to changes in the growth environment, the increase in contact between humans and animals, and changes in the adaptability of the virus, which crosses the western and eastern barriers and infects humans, and realizes the transmission between people. The main cause of SARS is infection with the SARS coronavirus.