PFGE patterns of SpeI-digested chromosomal DNA restriction fragments from K. oxytoca isolates resolved in 1% SeaKem Gold agarose. Lanes 1 and 11, molecular weight standards of lambda ladder. Lane 2, strain 1 (PFGE pattern A); lane 3, strain X (quality control strain); lane 4, strain 2 (PFGE pattern A); lane 5, strain 3 (PFGE pattern A); lane 6, strain 4 (PFGE pattern A); lane 7, strain 5 (PFGE pattern A); lane 8, strain 6 (PFGE pattern A); lane 9, strain 7 (PFGE pattern A); and lane 10, strain U (quality control strain).