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
Background Since the emergence of methicillin-resistant Staphylococcusaureus, the glycopeptide vancomycin has been the only uniformlyeffective treatment for staphylococcal infections. In 1997,two infections due to S. aureus with reduced susceptibilityto vancomycin were identified in the United States.
Methods We investigated the two patients with infections dueto S. aureus with intermediate resistance to glycopeptides,as defined by a minimal inhibitory concentration of vancomycinof 8 to 16 µg per milliliter. To assess the carriage andtransmission of these strains of S. aureus, we cultured samplesfrom the patients and their contacts and evaluated the isolates.
Results The first patient was a 59-year-old man in Michiganwith diabetes mellitus and chronic renal failure. Peritonitisdue to S. aureus with intermediate resistance to glycopeptidesdeveloped after 18 weeks of vancomycin treatment for recurrentmethicillin-resistant S. aureus peritonitis associated withdialysis. The removal of the peritoneal catheter plus treatmentwith rifampin and trimethoprimsulfamethoxazole eradicatedthe infection. The second patient was a 66-year-old man withdiabetes in New Jersey. A bloodstream infection due to S. aureuswith intermediate resistance to glycopeptides developed after18 weeks of vancomycin treatment for recurrent methicillin-resistantS. aureus bacteremia. This infection was eradicated with vancomycin,gentamicin, and rifampin. Both patients died. The glycopeptide-intermediateS. aureus isolates differed by two bands on pulsed-field gelelectrophoresis. On electron microscopy, the isolates from theinfected patients had thicker extracellular matrixes than controlmethicillin-resistant S. aureus isolates. No carriage was documentedamong 177 contacts of the two patients.
Conclusions The emergence of S. aureus with intermediate resistanceto glycopeptides emphasizes the importance of the prudent useof antibiotics, the laboratory capacity to identify resistantstrains, and the use of infection-control precautions to preventtransmission.
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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