Ethan Sky was 15 months when he first cultured pseudomonas. With him being so young, they of course did not test his sputum but just whatever was in his throat. We are a family that is very hesitant to do any treatment that is not proven absolutely necessary. With that, giving our son an inhaled treatment 2 times a day, that tastes terrible and takes 1/2 hour each time was much to hard to do without an absolute diagnosis. So.....we had him cultured 2 weeks later in which he came up positive for staph and we had him cultured at 18 months and he is still just culturing staph.
Hope that helps!!