Fig. 1

Electrophoresis of PCR product from S. Typhi hotspot gyrA. M = marker 100 bp, marker size from bottom to top (bp): 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1500. Numbers above the gel correspond to the isolate number in Additional file 1. All of the hotspot gyrA amplicons showed the expected fragments, i.e. 381 bp