Prevalence of ice elements of different types in V. cholerae

Abstract

With the help of a virtual PCR in silico analysis of the local database 395 genome-nucleotide sequences of Vibrio cholerae in the presence of ICE element. The results showed widespread ICE member from toxigenic strains and nontoxigenic Vibrio cholerae O1 serotype. Thus all elements of ICE successfully typed three basic types - «Indian», «Mozambique», or «the SXT». In this case up to 40 % nontoxigenic strains O1 serovar and nonO1/nonO139 carried ICE element. When analyzed by PCR in vitro collection of222 strains of Vibrio cholerae O1 serotype shows the presence of ICE element and determine its type in toxigenic strains isolated in recent years in the Russian Federation. All nontoxigenic O1, O139 and nonO1/nonO139 strains isolated in Russia, deprived of ICE element that differs from strains circulating in endemic cholera areas. This observation allows us to consider the presence of ICE element as a new epidemic marker «of invasive strains of» nontoxigenic Vibrio cholerae.