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Staphylococcus aureus is a gram-positive coccal bacterium that is a member of the Firmicutes, and is frequently found in the respiratory tract and on the skin forms where perspiration is present. It is often positive for catalase and nitrate reduction.he emergence of antibiotic-resistant forms of S. aureus such as MRSA is a worldwide problem in clinical medicine. Staphylococcus was first identified in 1880 in Aberdeen, Scotland, by the surgeon Sir Alexander Ogston in pus from a surgical abscess in a knee joint.
Staphylococcus bacteria are contagious, which means that anyone can contract a staph infection. A staph infection is caused by Staphylococcus bacteria. There are several different types of Staphylococcus bacteria (staph for short) that can cause infections in humans (see Staph Infection Causes) .Most of the time, they cause skin infections; however, staph bacteria can also cause more serious infections.taphylococcus bacteria are contagious, which means that anyone can contract a staph infection. A staph infection is caused by Staphylococcus bacteria. There are several different types of Staphylococcus bacteria (staph for short) that can cause infections in humans (see Staph Infection Causes) .