Hello , I understand your concern. I am Dr. Arun Tank, infectious disease specialist, answering your concern. First of all you have to rule out the MRSA infection in your friend. MRSA are resistant to multiple drugs prescribed routinely. It can transfer amongst other member of the family. So bedsheet, towels, clothes and other materials should be properly washed and disinfectants should be added. All the species of Staphylococcus causes the same pathogenicity, so differentiating in species wont cause treatment simple. I advice you should do Antimicrobial sensitivity of the organisms and take the treatment accordingly. Take the complete schedule of the drugs to prevent cross infections. Glad to answer your further concern. We wish you a best health at healthcare magic. Thank you, Dr. Arun Tank