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Journal of Clinical Microbiology, July 2004, p. 3094-3099, Vol. 42, No. 7
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.7.3094-3099.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Endemic, Epidemic Clone of Salmonella enterica Serovar Typhi Harboring a Single Multidrug-Resistant Plasmid in Vietnam between 1995 and 2002

Thi Anh Hong Le,1,2 Monique Lejay-Collin,2 Patrick A. D. Grimont,2 Thuy Long Hoang,1 Thi Vinh Nguyen,3 Francine Grimont,2* and Maurice R. Scavizzi4

Laboratoire d'Épidémiologie de la Résistance Bactérienne, Institut National d'Hygiène et d'Épidémiologie,1 University of Medicine of Hanoi, Hanoi, Vietnam,3 Unité de Biodiversité des Bactéries Pathogènes Émergentes, U389 INSERM, Institut Pasteur,2 Faculté de Santé, Médecine et Biologie Humaine de Bobigny, Université Paris Nord, Paris, France4

Received 22 October 2003/ Returned for modification 30 December 2003/ Accepted 13 April 2004

Salmonella enterica serovar Typhi strains resistant to ampicillin, chloramphenicol, tetracyclines, streptomycin, and cotrimoxazole, isolated from sporadic cases and minor outbreaks in Vietnam between 1995 and 2002, were typed and compared. Plasmid fingerprinting, Vi bacteriophage typing, XbaI pulsed-field gel electrophoresis, and PstI ribotyping showed that endemic, epidemic multidrug-resistant typhoid fever was due, for at least 74.1% of the isolates, to one or two clones of serovar Typhi harboring a single resistance plasmid. PstI ribotyping was used as a basic technique to ensure that a serovar Typhi expansion was clonal.

* Corresponding author. Mailing address: Unité de Biodiversité des Bactéries Pathogènes Émergentes, Institut Pasteur, 25-28 rue du Docteur Roux, 75 724 Paris cedex 15, France. Phone: 33 1 45 68 83 44. Fax: 33 1 45 68 88 37. E-mail: fgrimont{at}pasteur.fr.

Journal of Clinical Microbiology, July 2004, p. 3094-3099, Vol. 42, No. 7
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.7.3094-3099.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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