Staphylococcus aureus is the most common cause of staph infections. It is a round bacterium, often living on the skin or in the nose of a person. About one third of the U.S. population are carriers of Staph. Aureus  Staphylococcus aureus can cause a range of illnesses from minor skin infections to life-threatening diseases.
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- Heyman D. 2004. Control of communicable diseases manual. 19th ed, Washington DC: American Public Health Association.
- Methicillin is a type of synthetic penicillin, found in many antibiotics.