Home > Infectious Disease > MRSA Infection Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on Dec 20, 2007 by LDowdy, Views: 6890 MRSA-Methicillin Resistant Staphlococcus Aureus. This staph infection is resistant to penicillin and related medications. Hospital exposure is the most common cause, although it now occurs in the community. Skin infection that appears as a bug bite, that progresses to large boils or red painful areas is the most common problem, although some people will develop pneumonia, or blood infection. Antiobiotic treatments include tetracycline, and the sulfa drugs.