Hi JoAnn, I have 2 girls with cf. They are 16 and 10. My 16 year old has not cultured pseudomonas for 8 years now and my 10 year old had a cold this past week and her 2 cultures came back free of pseudomonas also. Erica, my 10 year old did have pseudomonas 2 years ago. Our Dr. said no to any antiobiotics. I feel it is really important for doctors to get cultures and confirm a bacterial infection before treating the child. To give you a little history. Both my girls have cultured pseudomonas in the past. The last time we had a hospitalization was in 1995. Although I am not advocating that you homeschool, we have seen a big difference in controlling our children's environment. Tanya, my 16 year old almost went through sinus surgery at the end of 6th grade( she was attending a private school) , however after having her home and in the airconditioning we noticed a change in her condition and the day before the surgery we canceled it. Perhaps your son is exposed to a lot of allergens at school, especially when they have rooms filled with carpet and books, and not to mention the fact that parents these days send sick kids to school. We have used Tobi very infrequently over the past few years. We find that the girls are not thrilled about tobi either but know that it helps when they need it. When my girls were first dignosed the Drs. wanted them on antibiotics all the time and I said no. I felt if they had an infection yes, it was warranted, but to cause their immune systems to break down it wasn't worth it. Please keep in mine that every person with cf has a different disease. What I mean, is what works for one may not work for another. I have tried many different things from vitamin therapies to increased cpt therapies. I have spent hours on researching the options. Tobi is excellent if your child has a pseudomonas infection. A new toy when the child has to do tobi is an nice distraction, I have found. I would ask as many questions as you can to make good decisions. Just a side note, my children have animals, 2 dogs, 8 rabbits, 4 birds. I don't use antibacterial soap anymore due to the increased risk of bacterial resistance. When my children were litlle I went crazy with cleaning my house etc. Now they get dirty, and thats ok! They catch colds and we increase the therapies. I hope this has helped. Please be encouraged; there is a lot you can do to keep your child healthy. Aloha, Heather