If a child has recurrent fevers for more than a week, the following are the main causes: First, the symptoms are caused by EBV infection, which often causes recurrent fevers for more than a week in children with EBV infection and is often accompanied by a sore throat and enlarged liver. If the diagnosis is due to EBV infection, the child can be given medications such as ganciclovir. Secondly, recurrent fevers caused by Kawasaki disease in young children can also cause recurrent fevers for more than a week, often accompanied by enlarged lymph nodes in the neck and even coronary artery aneurysms.