Molecular characterisation of rough strains ofVibrio choleraeisolated from diarrhoeal cases in India and their comparison to smooth strains

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Abstract
Sixteen of the 18 Vibrio cholerae rough strains isolated from hospitalised diarrhoea patients were found to contain O1 serotype-specific (wbe) genes and all currently known virulence genes. Expression of the regulatory element ToxR was evident in these strains. Cholera toxin production ability of the rough strains was found to be higher (c. three- to five-fold) as compared to the smooth counterparts and this was transcriptionally regulated. Strains exhibiting the rough phenotype were more amenable to the uptake of CTXφ, which led us to consider that the rough phenotype could play a role in the generation of genetic diversity among V. cholerae strains.