Hello

Most fever in children are from viruses but if he has it for more than 5 days, I would take him to his doctor for further evaluation. Hope he feels better.

In a 10 Y.O., you can watch his fever for three days only if he is eating/drinking fairly, voiding well and does not have any ready explanation for fever, e.g., exposure to certain illnesses and it stays below 103* F. You should still place a call to his physician.