Thank you for your query on HealthCareMagic.
If your child has not responded to the antibiotic in three days and fever
and shortness of breath
has developed then he needs to be re-examined and treated accordingly. The possible reasons can be:
1. Resistant strep
2. Infection spreading to the lungs which may be giving rise to shortness of breath
The doctor may perform some investigations in this situation.
I hope I have answered your query to your satisfaction.
Wishing your son a speedy recovery.