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Journal of Clinical Microbiology, March 2001, p. 1190-1194, Vol. 39, No. 3
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.3.1190-1194.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Isolation and Characterization of a Salmonella enterica Serotype Typhi Variant and Its Clinical and Public Health Implications

Patrick C. Y. Woo,1 Ami M. Y. Fung,1 Samson S. Y. Wong,1 Hoi-Wah Tsoi,1 and Kwok-Yung Yuen1,2,*

Department of Microbiology, The University of Hong Kong, University Pathology Building, Queen Mary Hospital,1 and HKU-Pasteur Research Centre,2 Hong Kong, Republic of China

Received 17 October 2000/Returned for modification 12 December 2000/Accepted 8 January 2001

We report the isolation and characterization of a member of the family Enterobacteriaceae isolated from the gallbladder pus of a food handler. Conventional biochemical tests suggested Salmonella enterica serotype Typhi, but the isolate agglutinated with poly(O), 2O, 9O, and Vi Salmonella antisera but not with poly(H) or any individual H Salmonella antisera. 16S rRNA gene sequencing showed that there were two base differences between the isolate and Salmonella enterica serotype Montevideo, four base differences between the isolate and serotype Typhi, five base differences between the isolate and Salmonella enterica serotype Typhimurium, and six base differences between the isolate and Salmonella enterica serotype Dublin, indicating that the isolate was a strain of S. enterica. Electron microscopy confirmed that the isolate was aflagellated. The flagellin gene sequence of the isolate was 100% identical to that of the H1-d flagellin gene of serotype Typhi. Sequencing of the rfbE gene, which encoded the CDP-tyvelose epimerase of the isolate, showed that there was a point mutation at position +694 (Gright-arrowT), leading to an amino acid substitution (Glyright-arrowCys). This may have resulted in a protein of reduced catalytic activity and hence the presence of both 2O and 9O antigens. We therefore concluded that the isolate was a variant of serotype Typhi. Besides antibiotic therapy and cholecystectomy, removal of all stones in the biliary tree was performed for eradication of the carrier state.

* Corresponding author. Mailing address: Department of Microbiology, The University of Hong Kong, University Pathology Building, Queen Mary Hospital, Hong Kong, Republic of China. Phone: (852) 28554892. Fax: (852) 28551241. E-mail: microgen{at}hkucc.hku.hk.

Journal of Clinical Microbiology, March 2001, p. 1190-1194, Vol. 39, No. 3
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.3.1190-1194.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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