Each of the Shigella genomes includes a virulence plasmid that encodes conserved primary virulence determinants. The Shigella chromosomes share most of their genes with those of E. coli K12 strain MG1655.
Each of the Shigella genomes includes a virulence pla.smid that encodes conserved primary virulence de,terminants. The Shigella chromosomes share most of their :genes with those of E. ?coli K.12 strain MG1655.