Newly Emerged Multiple-Antibiotic-Resistant Shigella dysenteriae Type 1 Strains in and around Kolkata, India, Are Clonal

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   FIG. 1.

   PFGE patterns of S. dysenteriae type 1 strains isolated from Kolkata after digesting genomic DNA with the XbaI restriction endonuclease enzyme. Lanes M, 48.5-kb concatemers of bacteriophage λ DNA (Bio-Rad, Hercules, Calif.) used as molecular size standards; lane 1, outbreak strain (X1 pulsotype); lanes 2 to 4, 6 to 8, and 10 to 12, strains from hospitalized cases (X1 pulsotype); lane 5, hospital strain (X1₁ subtype); lane 9, hospital strain (X1₂ subtype); lane 13, smearing of DNA.

• American Society for Microbiology