Relationship between Salmonella infection, shedding and serology in fattening pigs in low–moderate prevalence areas
Autor/a
San Román, B.
Garrido, V.
Sánchez, S.
Martínez‐Ballesteros, I.
Garaizar, J.
Mainar-Jaime, R. C.
Migura-Garcia, L.
Grilló, M. J.
Fecha de publicación
2018-04-27ISSN
1863-1959
Resumen
Salmonella is a major foodborne pathogen causing important zoonosis worldwide. Pigs asymptomatically infected in mesenteric lymph nodes (MLN) can be intermittent shedders of the pathogen through faeces, being considered a major source of human infections. European baseline studies of fattening pig salmonellosis are based on Salmonella detection in MLN. This work studies the relationship between Salmonella infection in MLN and intestinal content (IC) shedding at slaughter and the relationship between the presence of the pathogen and the serologic status at farm level. Mean Salmonella prevalence in the selected pigs (vertically integrated production system of Navarra, Spain) was 7.2% in MLN, 8.4% in IC and 9.6% in serum samples. In this low–moderate prevalence context, poor concordance was found between MLN infection and shedding at slaughter and between bacteriology and serology. In fact, most of shedders were found uninfected in MLN (83%) or carrying different Salmonella strains in MLN and in IC (90%). The most prevalent Salmonellae were Typhimurium resistant to ACSSuT ± Nx or ASSuT antibiotic families, more frequently found invading the MLN (70%) than in IC (33.9%). Multivariable analysis revealed that risk factors associated with the presence of Salmonella in MLN or in IC were different, mainly related either to good hygiene practices or to water and feed control, respectively. Overall, in this prevalence context, detection of Salmonella in MLN is an unreliable predictor of faecal shedding at abattoir, indicating that subclinical infections in fattening pigs MLN could have limited relevance in the IC shedding.
Tipo de documento
Artículo
Versión del documento
Versión aceptada
Lengua
Inglés
Páginas
26
Publicado por
Wiley
Publicado en
Zoonoses and Public Health
Citación
San Román, B., V. Garrido, S. Sánchez, I. Martínez-Ballesteros, J. Garaizar, R. C. Mainar-Jaime, L. Migura-Garcia, and M. J. Grilló. 2018. "Relationship Between Salmonella Infection, Shedding And Serology In Fattening Pigs In Low-Moderate Prevalence Areas". Zoonoses And Public Health 65 (5): 481-489. Wiley. doi:10.1111/zph.12453.
Program
Sanitat Animal
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