I have just read the posts and want to offer my story. I have been through all the same treatments with my son: Zyrtec, Singulair, nebulizers with albuterol, xopenex, countless antibiotics, vaporizers, dust-mite proof bedding....you name it....we had CF testing, ct scans, x-rays and it goes on until one day I went to a new pediatrician. My son had constant coughing, wheezing, nasal drainage, choking on phlegm....barium pudding like stools and I was nowhere. Then this man looked at him and told me something that no other doctor or specialist had mentioned. He said "This boy is allergic to dairy" Immediately I took him off cow's milk, cheese, yogurt, butter, eggs etc and within four days it was as if he had never been sick. Of course I am thrilled but I am so BITTER AND ANGRY that no doctor or specialist before had even entertained the idea of him being allergic to dairy. My neighbor who has a 3 year old daughter with asthma is doing this also. I know it may not be the answer for everybody but darn it I have spent so many anxious moments, days and nights fretting for my boy...I hope this helps someone out there. Do the research on dairy....some of it isn't pretty.