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    Baranzoni, Gian Marco Fratamico, Pina M. Gangiredla, Jayanthi Patel, Isha Bagi, Lori K. Delannoy, Sabine Fach, Patrick Boccia, Federica Anastasio, Aniello and Pepe, Tiziana 2016. Characterization of Shiga Toxin Subtypes and Virulence Genes in Porcine Shiga Toxin-Producing Escherichia coli. Frontiers in Microbiology, Vol. 7,


Shiga toxin-producing E. coli (STEC) in swine: prevalence over the finishing period and characteristics of the STEC isolates

  • M. TSENG (a1), P. M. FRATAMICO (a2), L. BAGI (a2), D. MANZINGER (a2) and J. A. FUNK (a1)
  • DOI:
  • Published online: 08 May 2014

This descriptive longitudinal study was conducted to investigate the faecal shedding of Shiga toxin-producing E. coli (STEC) in finishing swine and to characterize the swine STEC isolates that were recovered. Three cohorts of finishing swine (n = 50/cohort; total 150 pigs) were included in the longitudinal study. Individual faecal samples were collected every 2 weeks (8 collections/pig) from the beginning (pig age 10 weeks) to the end (pig age 24 weeks) of the finishing period. STEC isolates were recovered in at least one sample from 65·3% (98/150) of the pigs, and the frequency distribution of first-time STEC detection during the finishing period resembled a point-source outbreak curve. Nineteen O:H serotypes were identified among the STEC isolates. Most STEC isolates (n = 148) belonged to serotype O59:H21 and carried the stx2e gene. One O49:H21 STEC isolate carried the stx2e and eae genes. High prevalence rates of STEC during the finishing period were observed, and STEC isolates in various non-O157 serogroups were recovered. These data enhance understanding of swine STEC epidemiology, and future research is needed to confirm whether or not swine STEC are of public health concern.

Corresponding author
*Author for correspondence: Dr M. Tseng, Food Safety and Toxicology Building, 1129 Farm Lane Rm B41, East Lansing, MI 48824, USA. (Email:
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Epidemiology & Infection
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