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Original Article
Volume 340:493-501 February 18, 1999 Number 7
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Emergence of Vancomycin Resistance in Staphylococcus aureus
Theresa L. Smith, M.D., Michele L. Pearson, M.D., Kenneth R. Wilcox, M.D., Dr.P.H., Cosme Cruz, M.D., Michael V. Lancaster, Ph.D., Barbara Robinson-Dunn, Ph.D., Fred C. Tenover, Ph.D., Marcus J. Zervos, M.D., Jeffrey D. Band, M.D., Elizabeth White, M.S., William R. Jarvis, M.D., for The Glycopeptide-Intermediate Staphylococcus aureus Working Group

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 by Waldvogel, F. A.

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ABSTRACT

Background Since the emergence of methicillin-resistant Staphylococcus aureus, the glycopeptide vancomycin has been the only uniformly effective treatment for staphylococcal infections. In 1997, two infections due to S. aureus with reduced susceptibility to vancomycin were identified in the United States.

Methods We investigated the two patients with infections due to S. aureus with intermediate resistance to glycopeptides, as defined by a minimal inhibitory concentration of vancomycin of 8 to 16 µg per milliliter. To assess the carriage and transmission of these strains of S. aureus, we cultured samples from the patients and their contacts and evaluated the isolates.

Results The first patient was a 59-year-old man in Michigan with diabetes mellitus and chronic renal failure. Peritonitis due to S. aureus with intermediate resistance to glycopeptides developed after 18 weeks of vancomycin treatment for recurrent methicillin-resistant S. aureus peritonitis associated with dialysis. The removal of the peritoneal catheter plus treatment with rifampin and trimethoprim–sulfamethoxazole eradicated the infection. The second patient was a 66-year-old man with diabetes in New Jersey. A bloodstream infection due to S. aureus with intermediate resistance to glycopeptides developed after 18 weeks of vancomycin treatment for recurrent methicillin-resistant S. aureus bacteremia. This infection was eradicated with vancomycin, gentamicin, and rifampin. Both patients died. The glycopeptide-intermediate S. aureus isolates differed by two bands on pulsed-field gel electrophoresis. On electron microscopy, the isolates from the infected patients had thicker extracellular matrixes than control methicillin-resistant S. aureus isolates. No carriage was documented among 177 contacts of the two patients.

Conclusions The emergence of S. aureus with intermediate resistance to glycopeptides emphasizes the importance of the prudent use of antibiotics, the laboratory capacity to identify resistant strains, and the use of infection-control precautions to prevent transmission.


Source Information

From the Hospital Infections Program (T.L.S., M.L.P., M.V.L., F.C.T., W.R.J.) and the Division of Viral and Rickettsial Disease (E.W.), National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta; the Michigan Department of Community Health, Lansing (K.R.W., B.R.-D.); and William Beaumont Hospital, Royal Oak, Mich. (C.C., M.J.Z., J.D.B.).

Address reprint requests to Dr. Pearson at the Hospital Infections Program, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Rd., NE, MS E-69, Atlanta, GA 30333.

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