Figure 4From: A prospective case–control and molecular epidemiological study of human cases of Shiga toxin-producing Escherichia coli in New Zealand Comparison of PFGE profiles from 97 human E. coli O157:H7 isolates. PFGE profile comparison performed using UPGMA cluster analysis, Dice similarity coefficient, and 1% band matching tolerance. stx1, stx2a/c, stx2c virulence genes encoding for Shiga toxins present (1) or absent (0). Island of residence (Origin) presented as North Island (NI) or South Island (SI) of New Zealand, and genotypes of isolates as Shiga toxin (Stx)-encoding bacteriophage insertion (SBI) types.Back to article page