Hi, I had gone through your question and understand your concerns. Inhalation therapy including inhalation steroids is the best recommended treatment for such type of illness , but prophylactic treatment is be to taken regularly to be effective .Regular prophylactic therapy will make his symptoms better , but as of now there is no therapy to make changes in long term.Also you need to check immunization of your son , apart form routine vaccines he needs yearly flu vaccination. Hope this answers your question. If you have additional questions then please do not hesitate in writing to us. Take care. • DISCLAIMER: - All the information provided here is for information purpose only , it is not a substitute for the advice of a physician after physical examination , it is not intended to replace your relationship with your doctor. This information in no way establishes a doctor-patient relationship. Before acting anything based on this information do consult your doctor. I recommend that online users seek the advice of a physician who can perform an in-person physical examination