MRSA staph infectionMethicillin-Resistant Staph Aureus, more commonly known as MRSA. These organisms have developed as a direct result of the over-use of antibiotics, particularly in North America. They can currently be found in an increasing number of hospitals worldwide, and pose a great risk to any patient they contact. Only the strongest intravenous antibiotics, usually vancomycin, can be used to treat MRSA.