umm let me get this straight you had surgery, the wound never closed, you were sent home with instructions on how to care for the open wound and it got worse. You have a staph infection, and it is hospital acquired. The new MRSA test only takes 2 days for a result. I would not doubt it if you went to the same hospital you had the surgery and got some of the shittiest service once they found out you had an infection, from their services. You should have been hospitalized as they were trying to figure out what the infection is....and be put on bactrim for the time being.