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In page Escherichia coli O157:H7:
"All clinical isolates of E. coli O157:H7 possess the plasmid pO157.[3] The periplasmic catalase is encoded on pO157 and may enhance the virulence of the bacterium by providing additional oxidative protection when infecting the host.[4] E. coli O157:H7 non-hemorrhagic strains are converted to hemorrhagic strains by lysogenic conversion after bacteriophage infection of non-hemorrhagic cells.[citation needed]
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