Whether or not there are sequelae of viral infection is related to the type of virus and the patient’s condition, and the prognosis can be improved by active treatment under the guidance of a professional physician. Virus refers to the smallest and simplest microorganisms in nature, and there are many types of viruses, each of which has a different pathogenic process after infection, and there are individual differences in the resistance of patients to viruses, so it is not possible to generalize whether or not viral infections will leave sequelae, and some patients may have sequelae, while some patients have a good prognosis and will not have sequelae. For example, influenza virus, which is a common virus, can cause influenza after infection of the human body, patients may have fever, cough, fatigue, sore throat and other discomforts, the majority of patients with a course of 1 to 2 weeks, the prognosis is good; some patients with severe conditions can develop into severe cases, resulting in multiple organ function damage, leaving different degrees of sequelae, or even death. For example, poliovirus infection, which can lead to damage to the spinal cord nerves of the patient, the course of the disease is long and there is no cure, the patient can be left with skin sensory abnormalities, paralysis of the limbs and other sequelae, the vaccine can be effective in preventing the virus infection. Vaccination can effectively prevent this virus infection. Therefore, patients should be actively treated under the guidance of a professional physician to avoid delaying the disease and leading to adverse consequences.