XbaI pulsed-field gel electrophoresis patterns of S. enterica serotype Gambia isolates. Lanes: M, XbaI-digested DNA of S. enterica serotype Braenderup H9812, used as a molecular size marker; 1, Trousseau isolate 05-5446 (case 2); 2, Trousseau isolate 05-5447 (case 1) (similar pattern to that shown in lane 1). Unrelated isolates of S. enterica serotype Gambia (year of isolation, country of isolation): lane 3, 03-1573 (2003, unknown); lane 4, 03-5649 (2003, Senegal); lane 5, 03-6880 (2003, unknown); lane 6, 01-9145 (2001, unknown); lane 7, 97-8049 (1997, unknown); lane 8, 96-2611 (1996, unknown); and lane 9, serotype Gambia reference strain 543K (1953, Gambia).