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Diagnosis and Treatment |

Treatment of Infections Due to Methicillin-Resistant Staphylococcus aureus

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▸Requests for reprints should be addressed to Chatrchai Watanakunakorn, M.D.; St. Elizabeth Hospital Medical Center, 1044 Belmont Avenue, P.O. Box 1790; Youngstown, OH 44501.

Youngstown and Rootstown, Ohio

©1982 American College of PhysiciansAmerican College of Physicians

Ann Intern Med. 1982;97(3):376-378. doi:10.7326/0003-4819-97-3-376
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Strains of methicillin-resistant Staphylococcus aureus are resistant to other penicillins. The in-vitro susceptibility to the cephalosporins differs among strains. Some strains, susceptible to cephalosporins by the standard disk susceptibility test, are proved resistant by the quantitative dilution test; they may show pop-up colonies within the zone of inhibition when incubated further at room temperature. The clinical efficacy of the cephalosporins with or without an aminoglycoside in treating infections due to methicillin-resistant S. aureus is in doubt. To date, all strains of methicillin-resistant S. aureus have been susceptible to vancomycin. In-vitro antagonism of vancomycin and rifampin against S. aureus has been shown. Thus, vancomycin alone appears to be the treatment of choice; if this treatment fails, aminoglycoside or rifampin should be added. Serum bactericidal titers should be carefully monitored before and after the addition of the new agent and in-vitro time-kill studies of combination of antibiotics done if feasible.





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