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NeighborNet (16) tree showing geographic divergence of bovine and human Shiga toxin–producing Escherichia coli O157:H7 isolates sourced from New Zealand (40 cattle, 363 human), Australia (205 cattle, 79 human), and the United States (US) (143 cattle, 179 human). The distance indicates the difference in proportional similarity of Shiga toxin–encoding bacteriophage insertion types among the isolates.
