FIG. 1.

PFGE profiles of S. dysenteriae type 1 strains after digestion with XbaI. Strains D1, D2, D44, 18, 21, and 25 represent the 2002 dysentery epidemic. Strain AZ11 was isolated from Aizal in 2003. Strains HU8, HU10, and HU29 were isolated during a 1988 outbreak in Tripura. BCH518 was isolated from a patient with a sporadic case in 1995 in Calcutta. Strains NK2217, NK2490, and NK2678 and strains NT4359, H14174, and H16576 were isolated from patients with sporadic cases of dysentery at BCRCH and IDH, respectively, in 2002. The molecular size marker (leftmost lane) used here is the PFG lambda ladder.