Every year DS (13) ends up with severe chest infection, asthma & breathing problems. Yesterday he was taken to hospital by school with breathing difficulties. They have given him steroids and inhalers. He is very fit & sporty and otherwise in v.good health. Any ideas why this happens each autumn and are there any tests / investigations I can ask for? Often it can take 6 wks to recover from 1 bout, which is awful for him as he is in all the sports teams!