Prevalence, Virulence Profiles, and Clinical Significance of Shiga Toxin-Negative Variants of Enterohemorrhagic Escherichia coli O157 Infection in Humans

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Abstract
Background. Escherichia coli O157, of the H7 clone, exists in humans and in the environment as Shiga toxin (Stx)–positive and Stx-negative variants.

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