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Journal of Clinical Microbiology, July 1998, p. 2149-2152, Vol. 36, No. 7
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Molecular Epidemiology of Reemergent Vibrio cholerae O139 Bengal in India

Asish Kumar Mukhopadhyay,1 Arnab Basu,1 Pallavi Garg,1 Prasanta K. Bag,1 Amit Ghosh,2 S. K. Bhattacharya,1 Yoshifumi Takeda,3 and G. Balakrish Nair1,*

National Institute of Cholera and Enteric Diseases, Beliaghata, Calcutta-700010,1 and Institute of Microbial Technology, Chandigarh,2 India, and Research Institute, International Medical Center of Japan, Shinjuku-ku, Tokyo 162, Japan3

Received 10 December 1997/Returned for modification 15 March 1998/Accepted 22 April 1998

We report the prevalence of the O139 serogroup in Calcutta, India, after its reemergence in August 1996 and the spread of the reemerged clone to other parts of the country by using previously established molecular markers. Phenotypically, the reemerged Vibrio cholerae O139 displayed a difference compared to those that appeared in late 1992 and 1993 in that the current O139 strains are sensitive to co-trimoxazole. Ribotyping with the enzyme BglI produced two rRNA restriction patterns in the O139 strains isolated after August 1996, and these patterns were identical to those exhibited by strains of O139 isolated in 1992. Three clones of V. cholerae O139 are currently prevailing in the country, with strains exhibiting three bands after HindIII digestion and hybridization with a ctxA probe being dominant. The reemergence of V. cholerae O139 in Calcutta after a 32-month quiescent period reestablishes the O139 serogroup as an entity which is likely to play a crucial role in the temporal antigenic variations among the serogroups of V. cholerae causing cholera.

* Corresponding author. Mailing address: National Institute of Cholera and Enteric Diseases, P-33, CIT Rd., Scheme XM, Beliaghata, Calcutta-700 010, India. Phone: 91-33-350-5533. Fax: 91-33-350-5066. E-mail: krishgb{at}giascl01.vsnl.net.in.

Journal of Clinical Microbiology, July 1998, p. 2149-2152, Vol. 36, No. 7
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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