Thank you for your query.
From the details provided by you it appears that your son is having post-streptococcal arthritis
. You can continue giving him brufen
for pain relief.
A normal echo and PR interval on electrocardiogram suggests that there is no element of carditis
. However, he will require long term preventive medicine for streptococcal infection
. Long acting penicillin given every 3-4 weeks is the treatment of choice. However in compliant patients 250 mg. of oral penicilin twice daily can be given.
I hope I have answered your query to your satisfaction.
Wishing your son all the best.