STX2 and infection: The results showed that the colonies from laboratory strains of WG5, DH5α, and MG1655 were susceptible to the infection with both the Stx1-converting phage Lys8385Vzw and Stx2-converting phage Lys12581Vzw and became positive for either the stx1 or stx2 gene, indicating that both Stx-converting phages were able to lysogenize the laboratory strains WG5, DH5α, and MG1655 (Table 2).