Viruses of human lung infection refer to pathogens that can cause viral pneumonia, and common viruses are influenza A and B viruses, adenoviruses, parainfluenza viruses, respiratory syncytial viruses and coronaviruses. A variety of viruses can cause viral pneumonia, which is mainly an inhalation infection, transmitted through droplet transmission from person to person, mainly due to the downward spread of viral infections in the upper respiratory tract, often accompanied by tracheo-bronchitis. Occasionally, mucocutaneous contact infection is seen, and respiratory syncytial virus is transmitted through dust. Cases of viral pneumonia organ transplantation may cause hematogenous dissemination of the virus through multiple blood transfusions or even donor organs, usually without tracheo-bronchitis. In addition, herpes virus, measles virus, and cytomegalovirus can also cause viral pneumonia, most often in immunocompromised individuals. Patients may be infected by more than one virus at the same time and often have secondary bacterial infections.