My CF doctor tends to take this approach and it drives me crazy. For instance, he won't treat my (non-MRSA) staph at all, even though I have a lifetime history of getting very sick from it! Last fall I was really sick for several months and he tried everything - steroids, antifungals, zithromax (which does nothing for me, ever). It was not until he FINALLY gave me a prescription for levaquin that I miraculously got better in 3 weeks - and this was after 5 months (no joke) of doing treatments 4x a day, exercising my butt off, etc. etc. etc. To my mind, anyway, that proved that antibiotics were obviously what was needed!