Hi, I had gone through your question and understand your concerns. Based on your child s history and treatment received most likely reason for his illness seems to be allergic (reactive airway disease) , chances of which are more if there is family history of allergic also . If your child responds immediately to nebulisation , chances of allergy are very much. Inhalation therapy is the best recommended treatment for such type of illness , 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. Wishing your son speedy recovery. •     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