γγ”Pneumonia of unknown origin” refers to pneumonia in which the causative factors are not yet clear. This novel coronavirus pneumonia is tentatively called “pneumonia of unknown origin” until the novel coronavirus is isolated in the early stage, and it is mainly manifested by fever, malaise and dry cough. A small number of patients had symptoms such as nasal congestion, runny nose and diarrhea. In severe cases, respiratory distress develops after a week, with rapid progression to acute respiratory distress syndrome, septic shock, uncorrectable metabolic acidosis, and coagulation dysfunction.γγIt is worth noting that severe and critically ill patients may have moderate to low fever or even no significant fever during the course of the disease. In addition, some patients may also present with only low-grade fever, mild malaise, or no manifestations at all.