1887

Abstract

Shiga-toxin producing Escherichia coli (STEC) is a foodborne zoonotic pathogen of significant public health concern. Ruminant animals are considered the primary reservoir of STEC. STEC predominantly colonises the lower gastro-intestinal tract, termed the recto-anal junction (RAJ). The number of STEC shed in the faeces of ruminants can vary widely with some animals, termed ‘super-shedders’ (>Log104 c.f.u. g faeces), high risk carriers of the pathogen. The objective of this study was to sample a large cohort of Irish sheep, with quantitative and qualitative analysis of each sample for STEC. RAJ swab samples (N=410) were collected over a 9 month period from an ovine slaughtering facility. Each swab was enriched in 30 ml of modified Tryptone Soya Broth with Novobiocin at 41.5 °C for 5 h and subjected to a quantitative real-time PCR assay to detect and enumerate serogroups O157 and O26 in super-shedding animals. Incubation was allowed to continue for 24 h and shiga-toxin prevalence was assessed using a targeted qualitative real-time PCR assay. Eight O157 strains were isolated, of which six were super-shedding strains. The incidence of stx, O157 and O26 positive swabs was 49.3 %, 1.95 % and 0.24 % respectively. The prevalence of stx1, stx2 and stx1/stx2 virulence factors in isolated strains was 15.9 %, 8.8 % and 22.4 %. Additionally, the occurrence of stx1/stx2 in combination with eaeA in strains was found to be significant according to Pearson’s correlation and a paired T-test. In conclusion, these results underline the risk Irish sheep pose as a potential source of STEC infection.

  • This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Loading

Article metrics loading...

/content/journal/acmi/10.1099/acmi.ac2019.po0527
2019-04-08
2022-01-27
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/journal/acmi/10.1099/acmi.ac2019.po0527
Loading

Most cited this month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error