That's really odd to say that an ear infection is related to fleas....are her ears scabby (i.e., the pinna or flaps themselves rather than inside the ear as if she's been scratching them?). Not trying to play veterinarian here, but fleas don't cause ear infections. Having worked in the veterinary field for over 10 years, I definitely wouldn't surmise that pseudomonas infections are common, per se. Rather, they are not unheard of, if that makes sense. At any rate, putting that aside, I still wouldn't worry about pseudomonas in relation to CF....