my daughter with CF had cultured H.flu. She had symptoms, she had an ear infections that just would not quit; everytime she'ld come off the antibitoics it would come back. Finally she got swabbed and her cultured came back for H.flu. They put her on augmentim(i think) and she got better. I do not recall her culturing it again after that. But H flu is a common bug which can cause problems with ear infections...thins was a while ago.