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Volume 15, Number 2—February 2009

Letter

Outbreaks Caused by New Variants of Vibrio cholerae O1 El Tor, India

Neelam TanejaComments to Author , Arti Mishra, Garima Sangar, Gagandeep Singh, and Meera Sharma
Author affiliations: Postgraduate Institute of Medical Education and Research (PGIMER), Chandigarh, India

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Table

Phenotypic and genotypic traits of Vibrio cholerae O1 clinical strains isolated from northern India, 2002–2007*

Year of isolation or type of strain Phenotypic tests
PCR amplicons
VP Polymyxin B (50 U) susceptibility CCA Sheep erythrocyte hemolysis tcpA ctxB (MAMA-PCR) rstR
2002 (n = 20) + Resistant + + E E E
2003 (n = 4) + Resistant + + E E E
2004 (n = 19) + Resistant + + E E E
2007 (n = 26) + Resistant + + E E + C (n = 21)† E
Environmental (n = 1) + Resistant + + E E + C E
Classical 569B Sensitive C C C
El Tor N16961 + Resistant + + E E E
Hybrid NICED, India + Resistant + + E C E + C

*VP, Voges-Proskauer; CCA, chick cell agglutination; MAMA, mismatch amplification mutation assay; +, positive; –, negative; E, El Tor type; C, classical type; NICED, National Institute of Cholera and Enteric Diseases, Kolkata, India.
†Remainder had ctxB of El Tor type.

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