Novel coronavirus infections often have no precursors. A history of contact with a person in an infected area or contact with a suspected patient is a prerequisite for novel coronavirus infection. Infection with novel coronavirus can be completely asymptomatic during the incubation period. Some patients have early onset of the disease and may develop cough, sputum and fever in one to two days. Some patients may develop fever after 1-2 weeks, which is initially characterized by cough and fever. As the disease progresses and solid changes in the lungs occur, the patient will develop dyspnea, dyspnea and chest tightness and shortness of breath. This symptom of chest tightness and shortness of breath is progressively aggravated, which is a typical clinical manifestation of new coronavirus pneumonia. Source: Dr. Yurai