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Volume 15, Number 1—January 2009

Letter

Classical ctxB in Vibrio cholerae O1, Kolkata, India

Amit Raychoudhuri, Tapas Patra, Kausik Ghosh, Thandavarayan Ramamurthy, Ranjan K. Nandy, Yoshifumi Takeda, G. Balakrish Nair, and Asish K. MukhopadhyayComments to Author 
Author affiliations: National Institute of Cholera and Enteric Diseases, Kolkata, India (A. Raychoudhuri, T. Patra, K. Ghosh, T. Ramamurthy, R.K. Nandy, G.B. Nair, A.K. Mukhopadhyay); Collaborative Research Center of Okayama University for Infectious Diseases in India, Kolkata (Y. Takeda)

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Table

Prevalence of different types of ctxB alleles among Vibrio cholerae O1 strains, Kolkata, India, 1989–2005

Year isolated No. strains tested No. alleles
Classical ctxB El Tor ctxB Classical + El Tor ctxB
1989 6 0 6 0
1990 7 4 3 0
1991 10 8 0 2*
1992 10 4 5 1*
1993 6 4 2 0
1994 9 8 1 0
1995 23 23 0 0
1996 10 10 0 0
1997 10 10 0 0
1998 10 10 0 0
1999 10 10 0 0
2000 10 10 0 0
2001 10 10 0 0
2002 10 10 0 0
2003 10 10 0 0
2004 10 10 0 0
2005 10 10 0 0

*These strains carry the ctxB gene for El Tor as well as classical strains.

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