Thank you for your question.
I am Dr. Su S. and I will try my best to help you.
From his history, it is likely due to a viral infection.
Symptoms can vary.
You can wait & watch for a day more.
Viral infection usually subsides by 3-5 days, sometimes prolong though.
Only supportive measures are needed.
Please give him plenty of fluid to keep good hydration.
Tylenol is good to control fever.
Ibuprofen can be given as well.
However, I would recommend to get him examined if temperature gets higher or prolonged or if he develops any other symp***** *****ke sore throat, breathing difficulty etc.
I hope this information will be helpful.
If you have any query, please feel free to ask to continue conversation by using reply button.
This will help me to explain further & satisfy you.
If you are happy with my answer please click on the Excellent/Good rating.
Wish his healthy life.