When I first cultured MRSA I was in the hospital (surprise surprise) before the days when people would gown and glove up. I was started on vanc, and then was treated on and off with Bactrim. Bactrim worked for a few years until I felt it did pretty much nothing. If my MRSA flares up I do Doxycline, minocycline, or zyvox. for a few weeks. After having cultured MRSA for 5 years I only ever had 1 culture negative for it. It was right after my longest hospital stay (after coming in once I didn't feel better on doxycline).