identification, characterization, and distribution of a shiga toxin 1 gene variant (stx(1c)) in escherichia coli strains isolated from using sequence analysis of shiga toxin 1 (stx 1) genes from human and ovine stx-producing escherichia coli (stec) strains, we identified an stx1 variant in stec of human origin that was identical to the stx1 variant from ovine stec, but demonstrated only 97.1 and 96.6% amino acid sequence identity in its a and b subunits, respectively, to the stx1 encoded by bacteriophage 933j. we designated this variant "stx1c" and developed stxb(1) restriction fragment length polymorphism and stx(1c)-specif ...200211923370
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