Plasmid patterns of selected Tunisian clinical isolates of Salmonella serotype Mbandaka resistant to broad-spectrum cephalosporins. Lane A, isolate MMAS1 (pattern P1); lane B, isolate MMAS2 (pattern P2); lane C, isolate MMAS3 (pattern P3); lane D, isolate MMAS5 (pattern P1); lane E, isolate MMAS7 (pattern P4); lane F, isolate MMAS22 (pattern P7); lane G, isolate MMAS30 (pattern P6); lane H, isolate MMAS32 (pattern P6); lane I, isolate MMAS39 (pattern P1); lane J, isolate MMAS40 (pattern P8).