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icsb: a shigella flexneri virulence gene necessary for the lysis of protrusions during intercellular spread.shigella flexneri causes bacillary dysentery by invading epithelial cells of the colonic mucosa. we have characterized the icsb gene which is located on the virulence plasmid pwr100. after inactivation of icsb, the mutant strain remained invasive, but formed abnormally small plaques on hela cell monolayers, colonized only the peripheral cells of caco-2 islets, and was unable to provoke a keratoconjunctivitis in guinea-pigs. examination of infected hela cells showed that the icsb mutant was able ...19921495389
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