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Journal of Clinical Microbiology, November 2000, p. 4249-4253, Vol. 38, No. 11
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Emergence of Vibrio cholerae O1 Biotype El Tor Serotype Inaba from the Prevailing O1 Ogawa Serotype Strains in India

Pallavi Garg,1 Ranjan K. Nandy,1 Papiya Chaudhury,1 Nandini Roy Chowdhury,1 Keya De,1 T. Ramamurthy,1 Shinji Yamasaki,2 S. K. Bhattacharya,1 Yoshifumi Takeda,3 and G. Balakrish Nair1,*

Department of Microbiology, National Institute of Cholera and Enteric Diseases, Calcutta 700 010, India,1 and Research Institute, International Medical Center of Japan, Shinjuku-ku, Tokyo 162-8655,2 and National Institute of Infectious Diseases, Shinjuku-ku, Tokyo 162-8640,3 Japan

Received 4 April 2000/Returned for modification 1 July 2000/Accepted 20 August 2000

The toxigenic Inaba serotype of Vibrio cholerae O1 biotype El Tor reappeared in India in 1998 and 1999, almost 10 years after its last dominance in Calcutta in 1989. Extensive molecular characterization by ribotyping, restriction fragment length polymorphism, and pulsed-field gel electrophoresis indicated that recent Inaba strains are remarkably different from the earlier Inaba strains but are very similar to the prevailing V. cholerae O1 Ogawa El Tor biotype strains. The antibiograms of the Inaba strains were also similar to those of the recent V. cholerae Ogawa strains. These V. cholerae O1 Inaba strains appear to have evolved from the currently prevailing Ogawa strains and are likely to dominate in the coming years.

* Corresponding author. Mailing address: National Institute of Cholera and Enteric Diseases, P-33, CIT Rd., Scheme XM, Beliaghata, Calcutta 700 010, India. Phone: 91-33-3505533. Fax: 91-33-3505066. E-mail: gbnair{at}vsnl.com.

Journal of Clinical Microbiology, November 2000, p. 4249-4253, Vol. 38, No. 11
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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