Asked the dr, how I could have picked up the infection that the culture shows my knee has in it. She said any hospital setting is a good possibility as it's a form of strep and staph. On a 10 day course of antibotics and after the ten days that may not be enought to have cleared it up completely. May then be switched to a different antibotic.
There were times when I went to p/t and didn't cover the wound, and other times went to the dr. office, guess it would have been best to have it covered at all times, to prevent something like this from happening. Lesson learned to cover open wounds. It would have been a good safety procaution for me and for others who were also using the same equip.