Influenza A is influenza A. After having influenza A, the symptoms of high fever caused by the disease usually last for 3 to 4 days, provided that there are no complications. Influenza A, an acute respiratory infectious disease, is caused when the body is invaded by the influenza A virus, and children are one of the groups with a high incidence of the disease. For children with influenza A, high fever is a common symptom caused by the development of the disease. In the absence of complications, influenza A is self-limiting, and the body temperature will gradually normalize after 3 to 4 days of illness. However, if complications such as pneumonia, septic shock, or cardiac injury occur, the fever may last longer. Parents should be aware of the importance of helping children to prevent influenza A. If influenza A is detected and suspected to be present in a child, the child should seek medical attention in a timely manner.