| prevalence of virulence genes (ctxa, stn, ompw and tcpa) among non-o1 vibrio cholerae isolated from fresh water environment. | the virulence of a pathogen is reliant on the presence of a discrete set of genetic determinants and their expression in the host. the virulence of vibrio spp. is regulated by the ctxab and tcpa genes. these genes are alleged to be exclusively associated with clinical strains of o1 and o139 serogroups. in the present study, we examined the presence of virulence genes viz. stn, ompw, ctxa and tcpa of classical and eltor variants, in environmental strains of non-o1 vibrio cholerae cultured seasona ... | 2006 | 16891156 |