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This presentation can mean an allergic rhinitis
with extrinsic asthma
, which is generally associated with a secondary viral or bacterial infection casing recurrence
He is on right treatment and this is what is done generally, as he is very young, with age, his immunity will also increase and by 12 years I expect him to be fine if it is an asthma .
continue the steps your taking now to avoid dust, etc and I hope he feeds well . take him for his vaccinations and regular check ups.Avoid exposure to cold
climate and keep him clad when he is taken out preventing dust , cold, etc