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PFGE patterns of recovered E. coli O157 isolates. Patterns, designated A (initial inoculum) and A1, A2, A3, and A4 (variants), are indicated at the top. Lanes 1 and 15, bacteriophage lambda DNA ladder standard for PFGE applications (Bio-Rad); lane 2, inoculum; lanes 3 to 6, microcosms; lanes 7 and 8, drinking water; lanes 9 to 13, calves; lane 14, inoculum. Molecular sizes are indicated at left.
