Without medication, fever caused by viral infections in children usually lasts for 3 to 10 days, depending on the type of virus infected and the individual’s physical condition. Fever caused by viral infections in children usually lasts for about 3 to 10 days without medication. If the infected virus is adenovirus, the fever may last for 7~10 days, or even more than 10 days; if the infected virus is respiratory syncytial virus, the temperature may drop in about 2~3 days. The exact time varies depending on the type of virus infected. Children’s viral infections are also related to the individual’s physical condition. If the child’s physical condition is good, the fever will be shorter than that of a child infected with the same virus; conversely, it will be longer. Parents are advised to take their children to the doctor after discovering viral infections in children, and to treat them according to the cause of the disease after completing the relevant examinations.