Except in our case, it didn't take approximately 9 years either. It took 2.5 years, and we have every reason to believe his cultures were accurate enough to say he had no PA within a year of it first showing up. He first cultured PA spring of 2006. It showed mucoid 11/08. That's 2.5 years and not even remotely close to 9 years, not even approximately 9 years.
Not being argumentative, just pointing out that our experence with PA hasn't even been anywhere in the ballpark to what you've been told. And, while they did nothing to halt the PA sufficiently until he came here 18 months ago, they did culture him and put him on Tobi and that was 2.5-3 years before he showed that it has now gone mucoid, and its resistent to all but Timentin in our case.