Your son is not allergic. His problem was almost certainly due to repeated viral respiratory infections as a result of him attending the creche.This is known as the 'creche syndrome' You mention that he got better once he was out of the creche.He has had so many allergy tests done already,all of which are negative.The positive and negative control tests are only done to show that the tests are accurate.Your son's tests were accurate but all Negative, so he is not allergic. You can stop the Foxair treatment. It will help to keep on with the Singulair for another 2 months.
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