Severe Acute Respiratory Syndrome (SARS): until the cause is identified, it is called “atypical pneumonia”. Infectious atypical pneumonia, also known as SevereAcuteRespiratorySyndromes (SARS), is a new respiratory tract infection caused by SARS-associated coronavirus with fever, dry cough, chest tightness as the main symptoms and rapid progression of respiratory failure in severe cases. It is a new respiratory infection with strong infectivity and rapid progression of the disease. What are the symptoms that can be easily confused with it? It is important to distinguish it from common fever and cough. 1. Fever A regulated increase in body temperature (more than 0.5°C) caused by the upward shift of the thermoregulatory point due to the action of a pyrogen is called fever. Each person’s normal body temperature is slightly different and is affected by many factors (time, season, environment, menstruation, etc.). Therefore, the best way to determine if you have a fever is to compare it with your usual body temperature under the same conditions. If you do not know your original body temperature, an axillary body temperature (tested for 10 minutes) of more than 37.4°C can be defined as feverish. 2. Coughing is a protective respiratory reflex action of the body to remove secretions or foreign bodies from the respiratory tract. Although it has its beneficial side, a violent and prolonged cough can lead to bleeding in the respiratory tract. Correctly distinguish between general cough and cough variant asthma to prevent misdiagnosis. The disease refers to pneumonia caused by mycoplasma, chlamydia, legionella, rickettsia, adenovirus, and some other unknown microorganisms. on April 16, 2003, WHO announced that a new coronavirus is the cause of SARS and named it SARS coronavirus. (SARS-coronaryvirus,SARS-CoV). The virus likely originated from animals and crossed the germline barrier to humans and achieved human-to-human transmission due to changes in the external environment and increased viral adaptations. The coronavirus is a single-stranded positive-stranded RNA virus with a genome containing 29736 nucleotides, of which the genes encoding polymerase protein lalb, spine protein (S), small membrane protein (E), membrane protein (M), and nucleocapsid protein (N) have been identified. SARS virus has an envelope with spines on its surface and is sensitive to heat, ether, and acid. The resistance and stability of this virus are better than other human coronaviruses.