Shiga Toxin Subtypes and Virulence Genes in Escherichia coli Isolated from Cattle

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  • Akiyama Yumi
    Public Health Science Research Center, Hyogo Prefectural Institute of Public Health and Consumer Sciences
  • Futai Hiroko
    Public Health Science Research Center, Hyogo Prefectural Institute of Public Health and Consumer Sciences
  • Saito Etsuko
    Public Health Science Research Center, Hyogo Prefectural Institute of Public Health and Consumer Sciences
  • Ogita Kenichi
    Public Health Science Research Center, Hyogo Prefectural Institute of Public Health and Consumer Sciences Hyogo Prefectural Meat Inspection Center
  • Sakae Hiroshi
    Hyogo Prefectural Meat Inspection Center
  • Fukunaga Masaharu
    Hyogo Prefectural Meat Inspection Center
  • Tsuji Hidetaka
    Public Health Science Research Center, Hyogo Prefectural Institute of Public Health and Consumer Sciences
  • Chikahira Masatsugu
    Public Health Science Research Center, Hyogo Prefectural Institute of Public Health and Consumer Sciences
  • Iguchi Atsushi
    Department of Animal and Grassland Sciences, Faculty of Agriculture, University of Miyazaki

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  • Shiga Toxin Subtypes and Virulence Genes in <i>Escherichia coli</i> Isolated from Cattle

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Subtypes of stx1 and stx2 in 45 Shiga toxin-producing Escherichia coli (STEC) strains isolated from cattle were investigated by PCR. Only subtype stx1a was detected among all the stx1-positive strains. The major stx2 subtype was stx2a followed by stx2d, stx2c, stx2b, and stx2g in decreasing order of frequency. stx2c was found in strains of serotypes O157 and O174. stx2d was found in 11 strains. These strains were confirmed by DNA sequencing to carry both the activatable tail and the END motif; all were eae-negative, and 3 contained stx2d as the only stx. stx2g was found in 2 strains in association with stx2a, estA1, and astA. In addition, 7 hybrid strains of shigatoxigenic and enterotoxigenic E. coli (STEC/ETEC) were found to harbor one or both of stx1a and stx2a (stx1a/stx2a) and estA1. Among 27 serotypes of STEC strains isolated from cattle, O157:H7 and O109:H– strains were eae-positive. Other putative adhesin genes, such as saa, iha, espP, and lpfAO113 were detected in more than 12 serotypes.

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