Thank you for your query.
Your son seems to be suffering from upper respiratory tract
If his throat is red and he is spiking fever
then he might need an antibiotic like azithromycin
for 5 days.
If the fever persists in spite of the antibiotics then you might need to do some tests.
If the child worries consult your specialist.If you have any further queries you are free to consult me.Hope this answers your query.Wishing your child a speedy recovery.Have a nice day