Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 26. Chapters: Staphylococcus aureus, Methicillin-resistant Staphylococcus aureus, Panton-Valentine leukocidin, Staphylococcus epidermidis, Vancomycin-resistant Staphylococcus aureus, Staphylococcus nepalensis, Staphylococcus saprophyticus, Staphylococcal infection, Staphylococcus muscae, Staphylococcus warneri, ST8: USA300, Protein A, Macrococcus, Staphylococcus succinus, Macrococcus brunensis, Jeotgalicoccus, Gemella, Staphylococcus xylosus, Staphylococcus haemolyticus, Staphylococcus lugdunensis, Staphylococcus pettenkoferi, Salinicoccus, Staphylococcus hominis, Staphylococcus caprae, Gemella morbillorum, Nosocomiicoccus, Phenol-soluble modulin, Clumping factor A, Exfoliatin, Staphylokinase. Excerpt: Methicillin-resistant Staphylococcus aureus (MRSA) is a bacterium responsible for several difficult-to-treat infections in humans. It may also be called multidrug-resistant Staphylococcus aureus or oxacillin-resistant Staphylococcus aureus (ORSA). MRSA is, by definition, any strain of Staphylococcus aureus that has developed resistance to beta-lactam antibiotics which include the penicillins (methicillin, dicloxacillin, nafcillin, oxacillin, etc.) and the cephalosporins. MRSA is especially troublesome in hospitals and nursing homes where patients with open wounds, invasive devices and weakened immune systems are at greater risk of infection than the general public. A ruptured MRSA abscessS. aureus most commonly colonizes the anterior nares (the nostrils), although the rest of the respiratory tract, open wounds, intravenous catheters, and urinary tract are also potential sites for infection. Healthy individuals may carry MRSA asymptomatically for periods ranging from a few weeks to many years. Patients with compromised immune systems are at a significantly greater risk of symptomatic secondary infection. In most patients, MRSA can be..