Hello and thanks for trusting me to help you. I am a board certified consultant with over 30 years of experience.
I understand your concern.
Well as you describe,he can consult a MD medicine doctor or initially his regular doctor for evaluation and treatment.
If his infection'll persist then a referral to infectious disease doctor can be advised.
He should do saline gargles and steam inhalation.
Also do oral betadine rinse.
He should try nasal saline spray and OTC Robitussin DM.
Hydrate himself with plenty of fluids.
Take vitamin C lozenges.
Also elevate his head while sleeping.
Use a humidifier in his room.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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