http://en.wikipedia.org/wiki/Escherichia_coli
Like all lifeforms, new strains of E. coli evolve through the natural biological processes of mutation, gene duplication and horizontal gene transfer, in particular 18% of the genome of the laboratory strain MG1655 was horizontally acquired since the divergence from Salmonella.In microbiology, all strains of E. coli derive from E. coli K-12 or E. coli B strains. Some strains develop traits that can be harmful to a host animal. These virulent strains typically cause a bout of diarrhea that is unpleasant in healthy adults and is often lethal to children in the developing world. More virulent strains, such as O157:H7 cause serious illness or death in the elderly, the very young or the immunocompromised.
Like all lifeforms, new strains of E. coli evolve through the natural biological processes of mutation, gene duplication and horizontal gene transfer, in particular 18% of the genome of the laboratory strain MG1655 was horizontally acquired since the divergence from Salmonella.In microbiology, all strains of E. coli derive from E. coli K-12 or E. coli B strains. Some strains develop traits that can be harmful to a host animal. These virulent strains typically cause a bout of diarrhea that is unpleasant in healthy adults and is often lethal to children in the developing world. More virulent strains, such as O157:H7 cause serious illness or death in the elderly, the very young or the immunocompromised.
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