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Observations on the distribution and persistence of monophasic Salmonella Typhimurium on infected pig and cattle farms

Gosling, Rebecca J., Mueller-Doblies, Doris, Martelli, Francesca, Nunez-Garcia, Javier, Kell, Nick, Rabie, Andre, Wales, Andy D. and Davies, Robert H. (2018) Observations on the distribution and persistence of monophasic Salmonella Typhimurium on infected pig and cattle farms Veterinary Microbiology, 227. pp 90-96.

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Abstract

Following a rapid rise in cases of monophasic Salmonella Typhimurium DT193 (mST) in humans and pigs since 2007 a detailed study of the prevalence and persistence of mST on pig and cattle farms in Great Britain (GB) was undertaken. Thirteen commercial pig farms and twelve cattle farms, identified as mST-positive from surveillance data, were intensively sampled over a three year period. Five indoor and eight outdoor pig farms and four beef and eight dairy farms were included. Individual and pooled faecal samples were collected from each epidemiological group and environmental samples throughout each farm and the antimicrobial resistance profile determined for a selection of mST-positive isolates.

Indoor pig farms had a higher mST prevalence than outdoor pig farms, and across both cattle and pig farms the juvenile animals had a higher mST prevalence than the adult animals. Overall, mST prevalence decreased with time across all pig farms, from 25% to less than 15% of environmental samples and 22% to 15% of pooled faecal samples; only one organic outdoor breeding farm was Salmonella-negative at the end of the study. Across the cattle farms no mST was detected by the end of the study, apart from one persistent farm. Clearance time of mST was between seven and twenty-five months. Farms were selected based on having the antimicrobial resistance profile ampicillin, streptomycin, sulphonamides and tetracycline (A, S, SU, T), although resistance to trimethoprim-potentiated sulphamethoxazole was also identified on five pig farms sampled.

This study provided a detailed insight into the distribution and persistence of mST on individual pig and cattle farms in GB. It has identified variation in mST shedding of individual animals, and the data can be applied to the wider livestock industry when considering the distribution of mST once identified on an individual farm.

Item Type: Article
Divisions : Faculty of Health and Medical Sciences > School of Veterinary Medicine
Authors :
NameEmailORCID
Gosling, Rebecca J.
Mueller-Doblies, Doris
Martelli, Francesca
Nunez-Garcia, Javier
Kell, Nick
Rabie, Andre
Wales, Andy D.a.wales@surrey.ac.uk
Davies, Robert H.
Date : December 2018
Funders : Department for Environment, Food and Rural Affairs
DOI : 10.1016/j.vetmic.2018.10.032
Copyright Disclaimer : © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords : Monophasic Salmonella Typhimurium; Pigs; Cattle
Depositing User : Clive Harris
Date Deposited : 25 Feb 2019 08:52
Last Modified : 03 Sep 2019 08:26
URI: http://epubs.surrey.ac.uk/id/eprint/850559

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