Antimicrobial Use, Resistance and Residues

What Is the Level of Salmonella Shedding by Pigs at Farms and the Impact of Quaternary Ammonium Compound-Based Disinfectants on Antibiotic Resistance in Escherichia coli?

Authors: Christophe Soumet (ANSES) , Christelle Fablet (ANSES) , Arnaud Bridier (ANSES) , Béatrice Anger (ANSES) , Virginie Dorenlor (ANSES) , Valérie Rose (ANSES) , Florent Eono (ANSES) , Catherine Houdayer (ANSES) , Emmanuelle Houard (ANSES) , Eric Eveno (ANSES) , Florent Souchaud (ANSES) , Baptiste Houry (ANSES) , Charlotte Valentin (ANSES) , Paméla Houée (ANSES) , Annaëlle Kérouanton (ANSES) , Martine Denis (ANSES)

Abstract

The objectives of this study were to quantify Salmonella shedding in naturally infected pigs and the potential impact of biocides used as disinfectants on the evolution of antibiotic resistant in Escherichia coli (E. coli) strains. Faecal swabs were collected from lactating sows and finishing pigs in 4 farms visited three times. Salmonella enumeration and detection, serotyping and genotyping were done using standards methods. On three farms, the pen partitions and floor surfaces of 12 farrowing pens were swabbed before and after cleaning and disinfection (C&D) procedures. Total E. coli and E. coli resistant to antibiotics were counted before and after C&D. Salmonella-positive samples (52/240) were only found in finishing pigs. Almost two thirds of the countable samples (28/44) contained a low amount of Salmonella (<10 Most Probable Number of Salmonella/g). C&D procedures were efficient by reducing by 100 to 1000-fold E. coli and total bacteria counts on these herds. Moreover, antibiotic susceptibility profile had not evolved between E. coli strains before and after C&D during this study. These quantitative data on the level of Salmonella excretion in pigs naturally infected are important to enable better control of the risk associated with Salmonella contamination of food.

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How to Cite: Soumet, C. , Fablet, C. , Bridier, A. , Anger, B. , Dorenlor, V. , Rose, V. , Eono, F. , Houdayer, C. , Houard, E. , Eveno, E. , Souchaud, F. , Houry, B. , Valentin, C. , Houée, P. , Kérouanton, A. & Denis, M. (2023) “What Is the Level of Salmonella Shedding by Pigs at Farms and the Impact of Quaternary Ammonium Compound-Based Disinfectants on Antibiotic Resistance in Escherichia coli?”, SafePork. 14(1). doi: https://doi.org/10.31274/safepork.16311