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Journal of Clinical Microbiology, September 1998, p. 2730-2731, Vol. 36, No. 9
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Genotypic Characterization of Clarithromycin-Resistant and -Susceptible Helicobacter pylori Strains from the Same Patient Demonstrates Existence of Two Unrelated Isolates

Ge Wang, Qin Jiang, and Diane E. Taylor*

Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada

Received 2 February 1998/Returned for modification 7 April 1998/Accepted 21 May 1998

Clarithromycin-susceptible and clarithromycin-resistant Helicobacter pylori isolates from the same patient were investigated for the mode of development and mechanism of clarithromycin resistance. The clarithromycin-resistant strain UA1182 harbors homozygous A-to-G mutations at position 2143 in both copies of the 23S rRNA gene and has a phenotype of resistance to clarithromycin and clindamycin but no significant resistance to streptogramin B. Pulsed-field gel electrophoresis patterns of NruI- and NotI-digested genomic DNA from the Clas and Clar isolates demonstrated that they are genetically distinct, suggesting that the development of clarithromycin resistance is not from the mutation of the existing Clas strain but from a completely new strain.

* Corresponding author. Mailing address: Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada T6G 2H7. Phone: (403) 492-4777. Fax: (403) 492-7521. E-mail: diane.taylor{at}ualberta.ca.

Journal of Clinical Microbiology, September 1998, p. 2730-2731, Vol. 36, No. 9
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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