He has sore throat (pharyngitis) , it must be red (inflamed) hence the pain while swallowing.
Pain radiating to ear from throat could be tonsil infection.
Is the oxygen saturation maintained?
If it is, then don't worry.
He should continue taking the tablets as that will help him recover faster.
Next Steps
betadine gargles (4 times a day)
drink warm water
Health Tips
mixture of honey + turmeric (thrice a day) ,is a good homely remedy to sooth throat inflammation