Table 3. Distribution of various STEC-associated virulence genes among the non-O157 STEC isolates.

STEC, Shiga toxin-producing Escherichia coli; LEE, locus of enterocyte effacement; cdt, cytolethal distending toxin; subAB, subtilase cytotoxin AB; saa, STEC autoagglutinating adhesion; iha, IrgA homolog adhesion; ecpA, E. coli common pilus A; ehxA, enterohemolysin A; espP, E. coli serine protease; katP, catalase-peroxidase; B, beef; P, pork. ^*All isolates were polymerase chain reaction negative to the LEE-encoded genes, including eae (E. coli attachment effacement), tir (translocated intimin receptor), and espB (enteropathogenic E. coli secreted proteins B). ^†EDL933 strain was used as a control.