Although λBH2 phage did not completely repress Stx2 production, these are highly inducing nonphysiological conditions with fecal Stx2 concentrations (∼102 to 103 ng Stx2/g mouse stool) in excess of those encountered in human Stx-producing E. coli infections (∼2 to 50 ng Stx2/ml human stool) (35). The gene discussed is STX2; the disease is escherichia coli infection.