has role virmugen Escherichia coli gene virmugen role ler from Escherichia coli Oliver He gene NCBI_Gene_ID: 8219269; PMID: 19682616 Rebecca Racz A ler deletion mutant derived from wild-type EHEC O157:H7 86-24 was constructed by use of suicide vector pCVD442. Following challenge of 7-day-old suckling mice with O157:H7 EDL933, 75.2% born to group B mothers (immunized with F25) sur- vived, as did 83.0% born to group C mothers (immunized with F105). The surviving suckling mice consistently gained body weight. Only 16.8% of sucking mice born to control group mice survived the challenge