All individuals are susceptible to novel coronavirus pneumonia regardless of the presence of underlying disease, such as underlying lung disease or underlying liver disease. Elderly people, young people, and children have no resistance to novel coronavirus pneumonia and may become infected after exposure to novel coronavirus of a certain viral quality. However, the severity of the disease may vary among people with different underlying diseases and different ages. In particular, elderly people with underlying lung diseases may become sicker than young people or children after contracting novel coronavirus pneumonia and may become seriously ill. The risk of life-threatening illness may be higher. Content source: Dr. You Lai