The most important target organ of the novel coronavirus damage is the lung. When the novel coronavirus enters the lungs through the respiratory tract, the infected organism mobilizes the body’s immune system to kill the infected cells. The immune system causes leukocytes to accumulate and kill the infected cells, while increasing the number of macrophages in the tissue fluid, allowing blood components to enter the tissue fluid. There is a lot of water and cells in the interstitial space of the lung tissue, so the inflammatory infection results in bilateral solid lung whitening and reduced or even non-functional lung function. The lungs have ventilation, diffusion, and mainly ventilation functions. The main manifestation of the infection is dry cough, and in severe cases, dyspnea and a tendency of decreased blood oxygen saturation. And sore throat is the upper respiratory tract manifested as common cold causing upper respiratory tract infection, such as sore throat, pharynx, swelling of the pharynx, so these two manifestations are not consistent. Content source: Dr. You Lai