Shiga Toxin–Negative Attaching and EffacingEscherichia coli:Distinct Clinical Associations with Bacterial Phylogeny and Virulence Traits and Inferred In‐Host Pathogen Evolution

Abstract
Background. Attaching and effacing Escherichia coli (AEEC) that lack Shiga toxin genes (stx) and the enteropathogenic E. coli adherence factor (EAF)