Hey Mom of Dots, I have a 19 year old son, who for many years only cultured staph aureas. Whenever he had an exacerbation, i.e. lower than normal pulmonary function tests, decrease in weight, energy, and appetite, we would start out with the normal oral antibiotics, and Tobi & friends, with great success. Unfortunately, the nature of the disease being the constant barrage of low grade infection causes the immine system to respond by sending white blood cells to fight the inflamation that occurs constantly. The result of this is the waste or byproduct of the dead/used up wbc causeing the "scarring" or compromise in the lung tissue. This in turn causes the lungs to become less effective in clearing mucus, creating an ideal environment for more opportunistic bacteria such as psuedomonas aueriginosa, etc. to grow...the use of home IVs and more frequent visits to the Cf center & hospitalizations eventually become the norm. New therapy approaches are being used to fight the inflamation response such as Zythromax, Biaxan and Ibuprofin(used as a prophylactic/ anti-inflamatory agent) This has been found to help increase the pfts. In hind sight, and my 19 year old agrees, better pulmonary hygiene and exercise would have been the best RX to keeping his lung in peak form. So, yes, I would say this has been the normal course for our son's care. I felt, and agree that when it was time to get down to business, they did. Over use of antibiotics is a big cause of these resistent strains and they often feel if things are asymptomatic why treat and create a resistant culture. When she needs those meds for an exacerbation they can turn to them and have success in cleaning things up. Stay in touch.