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Lane 1 and 8:100bp DNA ladder (Invitrogen 15628–019; showing bands of 2072, 1500, 1400, 1300, 1200, 1100, 1000, 900, 800, 700, 600, 500, 400, 300, 200 and 100 bp), Lane 2–6: Vi-positive S. Typhi isolates, Lane 7: Vi- negative S. Typhi isolates.
