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Staphylococcus aureus on CAP agar (blood agar with 5% of defibrinated sheep blood, colistin and aztreonam). Cultivation 24 hours, aerobic atmosphere, 37°C.
Yellow pigmented colonies are surroundend by a wide zone of beta-hemolysis.
About one-third of people in the world have S. aureus bacteria on their bodies at any given time, primarily in the nose and on the skin. The bacteria can be present without causing an active infection. Of the people with S. aureus present, about 1 percent has MRSA, according to the Centers for Disease Control and Prevention (CDC).
S. aureus is the most common hospital-acquired infection in the United States. According to a recent analysis, nearly 300,000 hospitalized patients suffer an S. aureus infection every year in the United States, costing an estimated $9.5 billion in medical expenses. A growing number of S. aureus strains, such as methicillin-resistant S. aureus, are becoming resistant to the most commonly used antibiotics.
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