I think you've asked me this before, Karri. I believe I explained that it's a lot more complicated than that. Maybe your infection might have been seeded from the OR or something early in your recovery but as I understand it, that can then trigger the bio-film into action so the hibernating, immature bacterial cells begin to grow and reproduce. Trouble is, no-one really knows how or why the bio-film gets stimulated. All we do know at this time is that it bio-film is composed of immature bacterial cells that are in a kind of hibernation and something kick-starts them. The race is to find out that that something is. If we can do that, we stand a better chance of developing something that will keep those bugs immature and therefore no danger. Incidentally, our prostheses are not the only devices to be covered in bio-film. Stents, heart valves, catheters and pacemakers are also affected.