Children with recurrent high fever of 39 degrees for 5 days, indicating that the fever is relatively serious, should be treated to reduce fever, you can take oral ibuprofen suspension or acetaminophen suspension, as long as there are recurrent high fever, you can repeat the medication after 4-6 hours, as long as the medication is not more than four times a day. In addition, for children over the age of six, fever suppositories can be inserted into the anus of the child to reduce fever, which is also effective. It is also important to find out the cause of the fever, which is often caused by bacterial infections that last for a long time. If there are elevated white blood cells and elevated C-reactive protein in the routine blood test, it is usually a bacterial infection and the child needs to be treated with antibiotics. If the fever is prolonged, oral medication is often not effective enough, so intravenous ceftriaxone or cefoperazone is recommended for anti-inflammatory treatment.