Symptoms such as fever, nasal congestion, runny nose, dry cough, mild fatigue and even severe respiratory distress with multiple organ failure may occur after infection with the novel coronavirus. However, some patients have no obvious symptoms after infection. New coronary generally refers to the new coronary virus pneumonia, new coronary virus pneumonia is an inflammation of the lungs caused by the coronary virus, the main clinical manifestations of fever, dry cough, weakness and other symptoms, and is highly contagious. After infection with novel coronavirus, mild adult patients may have low-grade fever, nasal congestion, runny nose, mild fatigue, diarrhea, and dysgeusia (loss of taste). However, some patients have no obvious clinical symptoms after infection, i.e., those with asymptomatic infection. In severe cases, one week after the onset of the disease, respiratory distress, septic shock, and even multi-organ failure and other complicating phenomena can occur. A very small number of patients also develop central nervous system involvement (e.g., movement disorders, speech disorders) and other manifestations. In addition, severe and critically ill patients may have low to moderate fever or no apparent fever during the course of the disease. In addition, children with novel coronavirus pneumonia are not obviously symptomatic, and some pediatric patients may present with abdominal pain, diarrhea, and shortness of breath. A very small number of severely ill children may develop complications, such as fever with rash, blood clotting disorders, shock, and other symptoms. Tip: “New coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.