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Antimicrobial Agents and Chemotherapy, January 2001, p. 349-352, Vol. 45, No. 1
Laboratoire de Microbiologie, EA 1655, Hôpital Edouard Herriot, 69437 Lyon cedex 03, France,1 and AB BIODISK, S-169 56 Solna, Sweden2
Received 28 June 2000/Returned for modification 11 September
2000/Accepted 17 October 2000
A Staphylococcus aureus strain with low-level
heteroresistance to vancomycin (designated MER) but susceptible to
methicillin was isolated from an outpatient with conjunctivitis who did
not receive any glycopeptide antibiotics. Incubation of the parent strain, MER, with increasing concentrations of vancomycin led to rapid
selection of a stable progeny homogeneously resistant to vancomycin.
Electron micrographs of strain MER showed enhanced cell wall thickness
and abnormal septations typically seen with methicillin-resistant
S. aureus having intermediate susceptibility to vancomycin.
0066-4804/01/$04.00+0 DOI: 10.1128/AAC.45.1.349-352.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Clinical Isolate of Vancomycin-Heterointermediate
Staphylococcus aureus Susceptible to Methicillin and In
Vitro Selection of a Vancomycin-Resistant Derivative
*
Corresponding author. Mailing address: Laboratoire de
Microbiologie, EA 1655, Hôpital Edouard Herriot, 5 Place
d'Arsonval. 69437 Lyon cedex 03, France. Phone: 33 (0) 472 11 05 94. Fax: 33 (0) 472 11 07 64. E-mail: jetienne{at}univ-lyon1.fr.
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