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Sock and Environmental Swabs as an Efficient, Non-Invasive Tool to Assess the Salmonella Status of Sow Farms. Animals (Basel) 2023; 13:ani13061031. [PMID: 36978572 PMCID: PMC10044664 DOI: 10.3390/ani13061031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 03/03/2023] [Accepted: 03/08/2023] [Indexed: 03/14/2023] Open
Abstract
Salmonellosis is the second most reported gastrointestinal infection in humans after campylobacteriosis and a common cause of foodborne outbreaks in the European Union (EU). In addition to consumption of contaminated animal-based foods, such as poultry, beef and eggs, pork is an important source of human salmonellosis outbreaks; therefore, Salmonella (S.) control should start in the early stages of pig production. To be able to implement effective control measures to reduce the risk of pigs being infected by Salmonella, it is important to identify the serovars circulating on farm within the different stages of production, including as early as sow and piglet breeding. The aim of the present study was to assess the Salmonella status of sow farms either producing their own finishers or delivering piglets to fattening farms with a known high serological prevalence identified within the QS Salmonella monitoring system. Overall, 97 (92.4%) of 105 investigated piglet-producing farms across Germany tested positive in at least one sample. Salmonella was detected in 38.2% of the sock and 27.1% of the environmental swab samples. S. Typhimurium was the most frequent serovar. In conclusion, sock and environmental swab samples are well suited for non-invasive Salmonella detection in different production units in farrowing farms. To establish a holistic Salmonella control program, all age classes of pig production should be sampled to enable intervention and implementation of countermeasures at an early stage if necessary.
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Hollmann I, Lingens JB, Wilke V, Homann C, Teich K, Buch J, Chuppava B, Visscher C. Epidemiological Study on Salmonella Prevalence in Sow Herds Using Direct and Indirect Detection Methods. Microorganisms 2022; 10:1532. [PMID: 36013949 PMCID: PMC9413226 DOI: 10.3390/microorganisms10081532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 07/14/2022] [Accepted: 07/27/2022] [Indexed: 11/17/2022] Open
Abstract
In piglet production, the beginning of pork production, Salmonella prevalence requires greater attention as having an impact on the subsequent production steps. The aim of this study was to investigate Salmonella prevalence in three sow herds with attached piglet rearing units. Salmonella prevalence was investigated either directly by boot swabs and feces or indirectly by serum samples taken during gilt integration, the peripartal period, and piglet rearing. Boot swabs and feces were analyzed by real-time PCR and subsequent microbiology. Results indicated that high biosecurity measures in sow husbandry do not necessarily result in a low Salmonella prevalence. Furthermore, the sow herds' Salmonella prevalence should not be used to infer the situation in the associated piglet rearing. The proportion of positive boot swabs was 10.5, 3.6, and 21.3% for sows (gilts and peripartal) with an inverse situation in piglet rearing with 50.0, 63.3, and 5.8% positive swabs for farms A, B, and C, respectively. Boot swabs are suitable as a direct sampling method to gain an overview of Salmonella prevalence in both sows and piglets. Indirect serum antibody testing can be useful, although it should be evaluated considering age-dependent levels of antibody titres.
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Affiliation(s)
- Isabell Hollmann
- Institute for Animal Nutrition, University of Veterinary Medicine, Foundation, 30559 Hannover, Germany; (I.H.); (J.B.L.); (C.H.); (B.C.); (C.V.)
| | - Jan Berend Lingens
- Institute for Animal Nutrition, University of Veterinary Medicine, Foundation, 30559 Hannover, Germany; (I.H.); (J.B.L.); (C.H.); (B.C.); (C.V.)
| | - Volker Wilke
- Institute for Animal Nutrition, University of Veterinary Medicine, Foundation, 30559 Hannover, Germany; (I.H.); (J.B.L.); (C.H.); (B.C.); (C.V.)
| | - Christian Homann
- Institute for Animal Nutrition, University of Veterinary Medicine, Foundation, 30559 Hannover, Germany; (I.H.); (J.B.L.); (C.H.); (B.C.); (C.V.)
| | - Klaus Teich
- AniCon Labor GmbH, 49685 Emstek, Germany; (K.T.); (J.B.)
| | - Juhle Buch
- AniCon Labor GmbH, 49685 Emstek, Germany; (K.T.); (J.B.)
| | - Bussarakam Chuppava
- Institute for Animal Nutrition, University of Veterinary Medicine, Foundation, 30559 Hannover, Germany; (I.H.); (J.B.L.); (C.H.); (B.C.); (C.V.)
| | - Christian Visscher
- Institute for Animal Nutrition, University of Veterinary Medicine, Foundation, 30559 Hannover, Germany; (I.H.); (J.B.L.); (C.H.); (B.C.); (C.V.)
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Hollmann I, Lingens JB, Chuppava B, Wilke V, Abd El-Wahab A, Buch J, Hankel J, Ahmed MFE, Visscher C. In vitro evaluation of sodium butyrate on the growth of three Salmonella serovars derived from pigs at a mild acidic pH value. Front Vet Sci 2022; 9:937671. [PMID: 35958300 PMCID: PMC9360501 DOI: 10.3389/fvets.2022.937671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 06/28/2022] [Indexed: 11/16/2022] Open
Abstract
Foodborne zoonotic diseases can be transferred into the food chain at the stage of livestock farming. As an emerging public health challenge, practicable reduction measures in porcine health management for Salmonella are constantly being investigated. This in vitro study aimed to determine the influence of six different sodium butyrate (SB) concentrations (0, 5, 10, 20, 40, and 80 mM) on the growth of three different Salmonella enterica serovars at a constant pH value of 6.0, corresponding to conditions in the pig's hindgut. S. Derby and S. Typhimurium, isolated from a pig farm, and S. Typhimurium DSM 19587, which served as control, were used. Broth microdilution assay was applied to record Salmonella growth in the presence of different SB-concentrations over six different incubation periods (0, 1, 2, 4, 6, and 24 h). Results were quantified in the log colony-forming units (log10 CFU/mL). For 1 h incubation, the addition of SB showed no significant differences in the range of initial Salmonella dose of about 5.7 log10 between concentrations (0-80 mM, 5.26 ± 0.10-5.60 ± 0.07 log10, p > 0.05). After 6 h, for SB addition, the range of Salmonella counts was significantly lower compared to no addition of SB (5-80 mM, p < 0.05), 6.78 ± 0.84-7.90 ± 0.10 log10 for 5 mM, and 7.53 ± 0.04-8.71 ± 0.22 log10 for 0 mM. Moreover, for SB concentrations of 40 and 80 mM, no difference in the range of Salmonella counts over 6 h was obtained (5.23 ± 0.11-5.38 ± 0.05 log10, p > 0.05), and minor Salmonella growth was recorded at the earliest after 24 h incubation. Growth rates for varying SB concentrations and incubation times were confirmed in a similar manner for the three serovars. Obtained results suggest that increasing SB concentrations suppress Salmonella growth for concentrations of 5-20 mM over a 6 h incubation period and for 40 and 80 mM over a 24 h incubation period. When transferring these in vitro findings to the porcine organism, it may be assumed that Salmonella reduction can be achieved by increased butyrate content in the chyme of the large intestine.
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Affiliation(s)
- Isabell Hollmann
- Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, Hannover, Germany
| | - Jan Berend Lingens
- Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, Hannover, Germany
| | - Bussarakam Chuppava
- Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, Hannover, Germany
| | - Volker Wilke
- Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, Hannover, Germany
| | - Amr Abd El-Wahab
- Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, Hannover, Germany
- Department of Nutrition and Nutritional Deficiency Diseases, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Juhle Buch
- AniCon Labor GmbH, Höltinghausen, Germany
| | - Julia Hankel
- Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, Hannover, Germany
| | - Marwa F. E. Ahmed
- Hygiene and Zoonoses Department, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Christian Visscher
- Institute for Animal Nutrition, University of Veterinary Medicine Hannover, Foundation, Bischofsholer Damm 15, Hannover, Germany
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Santana AM, da Silva DG, Maluta RP, Pizauro LJL, Simplício KMDMG, Santana CH, Rodrigues SDAD, Rodrigues DDP, Fagliari JJ. Comparative Analysis Using Pulsed-Field Gel Electrophoresis Highlights a Potential Transmission of Salmonella Between Asymptomatic Buffaloes and Pigs in a Single Farm. Front Vet Sci 2020; 7:552413. [PMID: 33240945 PMCID: PMC7683720 DOI: 10.3389/fvets.2020.552413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 10/21/2020] [Indexed: 11/13/2022] Open
Abstract
Buffaloes and pigs play an important epidemiological roll in the Salmonella infection cycle, and asymptomatic animals can act as key component in the dissemination of the disease by horizontal, vertical, and cross-species transmission. Our study aimed and was able to confirm evidences of a cross-species transmission of Salmonella Agona between asymptomatic buffaloes and pigs. Also, we described Salmonella infection within the pig production phases, involving serotypes Agona, Senftenberg and Schwarzengrund. Rectal samples were collected from Jafarabadi buffaloes (n = 25) and Piau pigs (n = 32), located on a single farm. Salmonella Agona was isolated from lactating buffaloes, gilts, pregnant sows, and weaned pigs, Salmonella Schwarzengrund from lactating sows and Salmonella Senftenberg from gilts, pregnant sows, lactating sows, and weaned pigs. Pulsed-field Gel Electrophoresis protocol (PFGE) was performed and revealed four different profiles. Profile 1 (Salmonella Agona), isolated from a pregnant sow, a gilt and two lactating buffaloes, revealed a indistinguishable PFGE pattern, confirming evidences of potential cross-species transmission. Profile 2 (Salmonella Agona), 3 (Salmonella Senftenberg), and 4 (Salmonella Schwarzengrund), isolated from pigs, revealed important indistinguishable PFGE patterns, evidencing Salmonella infection within the pig production phases. Considering the epidemiological relevance of buffaloes and pigs in the cycle of Salmonella infection, confirmation of a potential cross-species transmission of Salmonella Agona and potential Salmonella infection within the pig production phases highlights the importance of the correct establishment of preventive health strategies in farms, in special the importance of avoiding contact between buffaloes and pigs, since cross-species transmission can occur, increasing the risk of spreading the disease.
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Affiliation(s)
- André Marcos Santana
- Department of Veterinary Medicine, Maringá State University (UEM), Maringá, Brazil
| | - Daniela Gomes da Silva
- Department of Veterinary Clinic and Surgery, School of Agricultural and Veterinary Sciences, São Paulo State University (FCAV/UNESP), São Paulo, Brazil
| | - Renato Pariz Maluta
- Department of Veterinary Pathology, School of Agricultural and Veterinary Sciences, São Paulo State University (FCAV/UNESP), São Paulo, Brazil
| | - Lucas José Luduverio Pizauro
- Department of Veterinary Clinic and Surgery, School of Agricultural and Veterinary Sciences, São Paulo State University (FCAV/UNESP), São Paulo, Brazil
| | | | - Clarissa Helena Santana
- Department of Veterinary Clinic and Surgery, School of Agricultural and Veterinary Sciences, São Paulo State University (FCAV/UNESP), São Paulo, Brazil
| | | | - Dália Dos Prazeres Rodrigues
- National Reference Laboratory Diagnosis of Enteric Bacteria, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, Brazil
| | - José Jurandir Fagliari
- Department of Veterinary Clinic and Surgery, School of Agricultural and Veterinary Sciences, São Paulo State University (FCAV/UNESP), São Paulo, Brazil
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Nair S, Farzan A, Poljak Z, Friendship R. Identifying Active Salmonella Infections in Swine Nurseries Using Serology and Bacterial Culture and Evaluating Associated Risk Factors. Animals (Basel) 2020; 10:ani10091517. [PMID: 32867163 PMCID: PMC7552155 DOI: 10.3390/ani10091517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/21/2020] [Accepted: 08/24/2020] [Indexed: 12/12/2022] Open
Abstract
The objectives of this study were: to identify nursery cohorts with an active Salmonella infection using combined serological and bacteriological methods, and to try to identify risk factors associated with swine nurseries with active Salmonella spread. Twenty pigs from each of 50 cohorts of weaned pigs from 44 different nursery barns were sampled about the time of weaning and near the end of the nursery stage. Information regarding farm management and biosecurity practices were collected using a questionnaire. Blood samples were obtained at both visits, while rectal swabs were collected at the second visit. An enzyme-linked immunosorbent assay (ELISA) was used to test sera for Salmonella antibodies and rectal samples were cultured for Salmonella. A nursery cohort was identified as having an active Salmonella infection if Salmonella was cultured from one or more of the 20 pigs or if serological evidence suggested exposure to Salmonella. The association between farm-level management covariates and active Salmonella infection was assessed in 46 cohorts using a logistic regression model. Nine of 46 (20%) cohorts produced Salmonella-free pigs. The remaining 37 (80%) cohorts were classified as having an active infection. Examination of risk factors failed to identify how negative and positive nurseries differed.
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Nair S, Farzan A, Weese JS, Poljak Z, Friendship RM. Effect of flavophospholipol on fecal microbiota in weaned pigs challenged with Salmonella Typhimurium. Porcine Health Manag 2020; 6:14. [PMID: 32426155 PMCID: PMC7216395 DOI: 10.1186/s40813-020-00151-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Accepted: 03/25/2020] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND The heightened prevalence of Salmonella Typhimurium remains a public health and food safety concern. Studies have reported antibiotic, flavophospholipol, may have the ability to reduce Salmonella in swine, as well as alter the gut microbiota in favour of beneficial bacteria by inhibiting pathogenic bacteria. Thus, the objective of this study was to investigate the fecal microbiota of weaned pigs receiving in-feed flavophospholipol and challenged with Salmonella Typhimurium. RESULTS Twenty-one weaned pigs were fed either a diet containing 4 ppm of flavophospholipol (treatment group) or a non-medicated feed (control group) for 36 days post-weaning (Day 1 to Day 36). The pigs were orally challenged with a 2 mL dose of 108 CFU/mL of S. Typhimurium at Day 7 and Day 8. Community bacterial DNA extracted from fecal samples collected at Day 6 (before challenge) and Day 36 (28 days after challenge) were used to assess the fecal microbiota using the V4 region of the 16S rRNA gene with Illumina MiSeq next-generation sequencing. Sequencing data were visualized using mothur and analyzed in JMP and R software. The fecal microbiota of pigs in the treatment group had differences in abundance of phyla (Firmicutes, Proteobacteria) and genera (Lactobacillus, Roseburia, Treponema, unclassified Ruminococcaceae, Blautia, Streptococcus, Megasphaera, Dorea, Sporobacter, Peptococcus, unclassified Firmicutes, Clostridium IV and Campylobacter) when compared to pigs that were controls, 28 days after challenge with Salmonella (P < 0.05). Specifically, results demonstrated a significant increase in phylum Proteobacteria (P = 0.001) and decrease in Firmicutes (P = 0.012) and genus Roseburia (P = 0.003) in the treated pigs suggestive of possible microbial dysbiosis. An increased abundance of genera Lactobacillus (P = 0.012) was also noted in the treated group in comparison to the control. CONCLUSION Based on these findings, it is difficult to conclude whether treatment with 4 ppm of flavophospholipol is promoting favorable indigenous bacteria in the pig microbiota as previous literature has suggested.
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Affiliation(s)
- Saranya Nair
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario Canada
| | - Abdolvahab Farzan
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario Canada
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario Canada
| | - J. Scott Weese
- Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario Canada
| | - Zvonimir Poljak
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario Canada
| | - Robert M. Friendship
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario Canada
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Peeters L, Dewulf J, Boyen F, Brossé C, Vandersmissen T, Rasschaert G, Heyndrickx M, Cargnel M, Mattheus W, Pasmans F, Haesebrouck F, Maes D. Evaluation of group vaccination of sows and gilts against Salmonella Typhimurium with an attenuated vaccine in subclinically infected pig herds. Prev Vet Med 2020; 182:104884. [PMID: 32536448 DOI: 10.1016/j.prevetmed.2020.104884] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 10/30/2019] [Accepted: 01/05/2020] [Indexed: 12/19/2022]
Abstract
Subclinical Salmonella Typhimurium infections occur frequently in pigs and constitute a major risk for human salmonellosis. With the currently available control measures, Salmonella Typhimurium infections in pigs remain difficult to control. Vaccination has been proposed to be an effective tool to control infections at farm level. In the current study, the effect of group vaccination of sows and gilts against Salmonella Typhimurium is evaluated on Salmonella prevalence in fecal and overshoe samples and ileocecal lymph nodes, and on serology in the sows and their offspring in three subclinically infected pig farms. In each farm, all sows and gilts were vaccinated twice, three weeks apart, with an attenuated histidine-adenine auxotrophic vaccine (Salmoporc®, IDT Biologika). From three months after the group vaccination onwards, all sows were given a booster dose three weeks before every farrowing. The farms were monitored bacteriologically and serologically from 12 months before until 15 months after the group vaccination. After group vaccination, no significant effect was detected in the prevalence of Salmonella Typhimurium in the fecal and overshoe samples collected in the sows (before: 2 %, after: 0 %) and their offspring at 18 weeks (before: 17 %, after: 11 %) and at 26 weeks of age (before: 15 %, after: 7 %), and when combining the results of the offspring at 18 and 26 weeks of age (before: 16 %, after: 9 %). Also, no significant effect was detected in the prevalence of Salmonella Typhimurium positive lymph nodes of sows (before and after: 0 %) and their offspring (before: 4 %, after: 7 %). Regarding serology, the mean S/P-ratios of the sows were significantly higher after the group vaccination, compared to before group vaccination (before: 1.50, after: 2.32, p < 0.001). The mean S/P-ratios of the offspring at slaughter age were significantly lower after the group vaccination, compared to before group vaccination (before: 1.71, after: 1.04, p = 0.001). In conclusion, group vaccination of sows and gilts resulted in a more beneficial serological status of the offspring, but did not significantly decrease Salmonella Typhimurium excretion and lymph node contamination.
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Affiliation(s)
- L Peeters
- Faculty of Veterinary Medicine, Department of Reproduction, Obstetrics and Herd Health, Ghent University, Merelbeke, Belgium.
| | - J Dewulf
- Faculty of Veterinary Medicine, Department of Reproduction, Obstetrics and Herd Health, Ghent University, Merelbeke, Belgium
| | - F Boyen
- Faculty of Veterinary Medicine, Department of Pathology, Bacteriology and Avian Diseases, Ghent University, Merelbeke, Belgium
| | - C Brossé
- Animal Health Care Flanders (DGZ), Lier, Belgium
| | | | - G Rasschaert
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Melle, Belgium
| | - M Heyndrickx
- Faculty of Veterinary Medicine, Department of Pathology, Bacteriology and Avian Diseases, Ghent University, Merelbeke, Belgium; Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Melle, Belgium
| | - M Cargnel
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Sciensano, Brussels, Belgium
| | - W Mattheus
- Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Sciensano, Brussels, Belgium
| | - F Pasmans
- Faculty of Veterinary Medicine, Department of Pathology, Bacteriology and Avian Diseases, Ghent University, Merelbeke, Belgium
| | - F Haesebrouck
- Faculty of Veterinary Medicine, Department of Pathology, Bacteriology and Avian Diseases, Ghent University, Merelbeke, Belgium
| | - D Maes
- Faculty of Veterinary Medicine, Department of Reproduction, Obstetrics and Herd Health, Ghent University, Merelbeke, Belgium
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Casanova-Higes A, Marín-Alcalá CM, Andrés-Barranco S, Cebollada-Solanas A, Alvarez J, Mainar-Jaime RC. Weaned piglets: another factor to be considered for the control of Salmonella infection in breeding pig farms. Vet Res 2019; 50:45. [PMID: 31215485 PMCID: PMC6582532 DOI: 10.1186/s13567-019-0666-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 06/04/2019] [Indexed: 11/12/2022] Open
Abstract
Field studies on Salmonella infection in suckling piglets are scarce due to the intrinsic difficulties of collecting proper samples (i.e. tonsils or mesenteric lymph nodes), and most of them rely on the analysis of rectal swabs that limit their accuracy. We used 495 slaughtered 4-weeks-old male piglets intended for human consumption from 5 Salmonella-seropositive breeding farms to collect gastrointestinal packages and perform a thorough detection of Salmonella on mesenteric lymph nodes and intestinal content. The overall prevalence of both infection and shedding was high (≈ 36%) indicating that piglets played an active role in Salmonella maintenance in the farms. Major serotypes found in piglets included 4,[5],12:i: (35.4%), Rissen (17.1%), Derby (10.9%) and Bovismorbificans (10.3%). In most of the infected animals (72.8%) the same serotype was found in mesenteric lymph nodes and feces. Significant higher ELISA OD% values were found in meat juice samples from non-infected piglets compared to infected ones (median OD% of 12.0 and 17.3, respectively; P = 0.002) suggesting some protective effect of sow's colostrum. Salmonella was also isolated from feces from weaned sows contemporary of the slaughtered piglets, and 89% of the serotypes identified in sows were also detected in piglets. Pulsed field gel electrophoresis analyses showed that 75% of the piglet isolates that were compared to those of sows were related to them, suggesting the circulation of Salmonella strains between sows and piglets. It appears that improving piglet colostrum intake along with the reduction of the shedding in sows may favor the control of Salmonella infection in breeding farms.
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Affiliation(s)
- Alejandro Casanova-Higes
- Unidad de Producción y Sanidad Animal, Centro de Investigación y Tecnología Agroalimentaria de Aragón, Instituto Agroalimentario de Aragón-IA2-(CITA-Universidad de Zaragoza), Zaragoza, Spain
| | - Clara Mª Marín-Alcalá
- Unidad de Producción y Sanidad Animal, Centro de Investigación y Tecnología Agroalimentaria de Aragón, Instituto Agroalimentario de Aragón-IA2-(CITA-Universidad de Zaragoza), Zaragoza, Spain
| | - Sara Andrés-Barranco
- Unidad de Producción y Sanidad Animal, Centro de Investigación y Tecnología Agroalimentaria de Aragón, Instituto Agroalimentario de Aragón-IA2-(CITA-Universidad de Zaragoza), Zaragoza, Spain
| | - Alberto Cebollada-Solanas
- Grupo de Genética de Micobacterias, Departamento de Microbiología, Medicina Preventiva y Salud Pública, Universidad de Zaragoza, Zaragoza, Spain
- Unidad de Biocomputación, Instituto Aragonés de Ciencias de la Salud (IACS/IIS Aragón), Centro de Investigación Biomédica de Aragón (CIBA), 50009, Zaragoza, Spain
- CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Julio Alvarez
- Centro de Vigilancia Sanitaria Veterinaria VISAVET, Universidad Complutense de Madrid, 28040, Madrid, Spain
- Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, Madrid, Spain
| | - Raúl C Mainar-Jaime
- Departamento de Patología Animal, Facultad de Veterinaria, Instituto Agroalimentario de Aragón-IA2 (Universidad de Zaragoza-CITA), Zaragoza, Spain.
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Effects of attenuated vaccine protocols against Salmonella Typhimurium on Salmonella serology in subclinically infected pig herds. Vet J 2019; 249:67-72. [PMID: 31239168 DOI: 10.1016/j.tvjl.2019.05.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 05/21/2019] [Accepted: 05/21/2019] [Indexed: 02/06/2023]
Abstract
Vaccination of pigs against Salmonella Typhimurium (S. Typhimurium) can be effective for the control of Salmonella infections at the farm level and reduce the risk of Salmonella contamination in the food chain. However, vaccination may interfere with herd serological status in serology-based Salmonella monitoring programs. The present study investigated the effects of an attenuated S. Typhimurium vaccine (Salmoporc, IDT Biologika) on Salmonella serology in sows, neonatal piglets and slaughter pigs from three subclinically infected herds. Within each herd, five different vaccination protocols were tested as follows: group 1, vaccination of sows; group 2, vaccination of sows and piglets; group 3, vaccination of sows and fattening pigs; group 4, vaccination of piglets; and group 5 vaccination of fattening pigs. Each group was compared to a non-vaccinated control group (group 6). Sera were analyzed by ELISA (HerdChek Swine Salmonella, IDEXX Laboratories) and sample-to-positive (S/P) ratios were calculated. At day 3 after farrowing, but not before vaccination, S/P ratios in vaccinated sows (mean: 2.21) were significantly higher than S/P ratios in non-vaccinated sows (mean: 0.87, P<0.001). S/P ratios in 3-day old piglets from vaccinated sows (mean: 2.46) were significantly higher than S/P ratios in similar piglets from non-vaccinated sows (mean: 0.73, P<0.001). At slaughter, S/P ratios in pigs from groups 2, 3, 4 and 5 were significantly higher than those in the non-vaccinated control group (P<0.001). Therefore, vaccination of piglets and fattening pigs could have implications for current serology-based Salmonella monitoring programs in slaughter pigs.
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10
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Bacteriological evaluation of vaccination against Salmonella Typhimurium with an attenuated vaccine in subclinically infected pig herds. Prev Vet Med 2019; 182:104687. [PMID: 31126632 DOI: 10.1016/j.prevetmed.2019.04.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 04/28/2019] [Accepted: 04/28/2019] [Indexed: 02/06/2023]
Abstract
Subclinical infections with Salmonella Typhimurium occur frequently in pigs. They constitute a risk for human salmonellosis and are difficult to control with currently available control measures. Vaccination against Salmonella Typhimurium in pigs can be an effective tool to control Salmonella infections at farm level. In the present study, the efficacy of an attenuated Salmonella Typhimurium vaccine (Salmoporc®, IDT Biologika) to control Salmonella infections in pigs was evaluated in three subclinically infected pig herds. The effect on Salmonella excretion and the number of pigs positive for Salmonella Typhimurium field and vaccine strains in ileocecal lymph nodes at slaughter were evaluated using five different vaccination strategies: 1. vaccination of sows, 2. vaccination of sows and piglets, 3. vaccination of sows and fattening pigs, 4. vaccination of piglets, 5. vaccination of fattening pigs, which were all compared to a non-vaccinated control group (experimental group 6). Each vaccination strategy was implemented in each farm, during two consecutive production cycles of the same sows. The prevalence of Salmonella Typhimurium field strain excretion was low; in total, 4% of the fecal and overshoe samples collected in the non-vaccinated control group were Salmonella Typhimurium field strain positive. The excretion of Salmonella Typhimurium field strain did not significantly differ between farms, production cycles and experimental groups. Applying vaccination in either sows and piglets, sows and fattening pigs, or in piglets only, resulted in a significantly reduced number of Salmonella Typhimurium field strain positive lymph nodes of slaughter pigs in the second production cycle, but not in the first production cycle. Vaccination of sows and piglets resulted in the most consistent reduction of Salmonella Typhimurium field strain positive lymph nodes at slaughter. The vaccine strain was detected in the lymph nodes of 13 pigs at slaughter, indicating the possible persistence of the vaccine strain until slaughter. Because of limitations in the study design, and the variability between farms and production cycles, the results of the current observational study should be extrapolated with care. Nevertheless, the results provide evidence that applying vaccination against Salmonella Typhimurium in sows and piglets (preferred), sows and fattening pigs, and piglets only can support the control of Salmonella Typhimurium infections by decreasing the prevalence of Salmonella Typhimurium field strain positive lymph nodes at slaughter.
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11
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Magossi G, Bai J, Cernicchiaro N, Jones C, Porter E, Trinetta V. Seasonal Presence of Salmonella spp., Salmonella Typhimurium and Its Monophasic Variant Serotype I 4,[5],12:i:-, in Selected United States Swine Feed Mills. Foodborne Pathog Dis 2019; 16:276-281. [DOI: 10.1089/fpd.2018.2504] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Gabriela Magossi
- Food Science Institute, Kansas State University, Manhattan, Kansas
| | - Jianfa Bai
- Kansas State Veterinary Diagnostic Laboratory, Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Natalia Cernicchiaro
- Kansas State Veterinary Diagnostic Laboratory, Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
| | - Cassandra Jones
- Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas
| | - Elizabeth Porter
- Kansas State Veterinary Diagnostic Laboratory, Department of Diagnostic Medicine/Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
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12
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Peeters L, Mostin L, Wattiau P, Boyen F, Dewulf J, Maes D. Efficacy of Clostridium butyricum as probiotic feed additive against experimental Salmonella Typhimurium infection in pigs. Livest Sci 2019. [DOI: 10.1016/j.livsci.2018.12.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Martínez-Avilés M, Garrido-Estepa M, Álvarez J, de la Torre A. Salmonella Surveillance Systems in Swine and Humans in Spain: A Review. Vet Sci 2019; 6:E20. [PMID: 30791671 PMCID: PMC6466228 DOI: 10.3390/vetsci6010020] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 02/13/2019] [Accepted: 02/16/2019] [Indexed: 01/02/2023] Open
Abstract
Non-typhoid salmonellosis is a common and problematic foodborne zoonotic disease in which pork and pork products can be an important potential source of infection. To prevent this disease, important efforts to monitor the situation in the main source, livestock, are conducted in most developed countries. In the European Union, European Food Safety Agency (EFSA) and European Center for Disease Control (ECDC) compile information at the member-state level, even though important differences in production systems and surveillance systems exist. Here, Salmonella surveillance systems in one of the main sources of foodborne salmonellosis, swine, and humans in Spain were reviewed to identify potential gaps and discuss potential ways of integration under a "One-Health" approach. Despite the extensive information generated through the surveillance activities, source attribution can be only routinely performed through ad-hoc outbreak investigations, and national reports on human outbreaks do not provide sufficiently detailed information to gain a better understanding of the epidemiology of the pathogen. Human and animal monitoring of Salmonella would benefit from a better exchange of information and collaboration. Analysis of spatio-temporal trends in livestock and humans could help to identify likely sources of infection and to target surveillance efforts in areas with higher prevalence or where specific strains are found.
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Affiliation(s)
- Marta Martínez-Avilés
- Animal Health Research Center (INIA-CISA), Ctra Algete a El Casar s/n, 28130, Valdeolmos, 28040 Madrid, Spain.
| | - Macarena Garrido-Estepa
- Animal Health Research Center (INIA-CISA), Ctra Algete a El Casar s/n, 28130, Valdeolmos, 28040 Madrid, Spain.
| | - Julio Álvarez
- VISAVET Health Surveillance Center, Complutense University of Madrid, 28040 Madrid, Spain.
| | - Ana de la Torre
- Animal Health Department, Veterinary School, Complutense University of Madrid, 28040 Madrid, Spain.
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14
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Schut CH, Farzan A, Ainslie-Garcia MH, Friendship RM, Lillie BN. Antibody Responses to Salmonella in Pigs from Weaning Up to Marketing and Presence of Salmonella at Slaughter. Foodborne Pathog Dis 2018; 16:187-194. [PMID: 30481060 DOI: 10.1089/fpd.2018.2454] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Salmonella is estimated to be one of the leading causes of enteric illness worldwide. Human salmonellosis is most frequently related to contaminated food products, particularly those of animal origin, such as pork. Pigs are often asymptomatic carriers of Salmonella, highlighting the importance of identifying high-prevalence farms and effective detection methods. The objectives of this study were to investigate Salmonella antibody responses and their association with on-farm shedding and Salmonella isolation at slaughter. Fourteen groups of pigs from eight farrowing sources were followed from birth to slaughter (totaling 796 pigs). Information about farm management was collected through a questionnaire. Blood and fecal samples were collected four times at different stages of production, and palatine tonsils/submandibular lymph nodes were obtained at slaughter. Sera were tested for Salmonella antibodies by enzyme-linked immunosorbent assay, and fecal/tissue samples were cultured for Salmonella. Data were analyzed using a mixed-effect multivariable modeling method with farm, litter, and pig as random effects. Salmonella seropositivity rates were 20.3%, 5.8%, 15.9%, and 37.3% at weaning, at the end of nursery, at end of grower, and at end of finisher, respectively. Salmonella seropositivity and shedding increased with age (p < 0.05), and pigs shedding Salmonella were more likely to test seropositive (p = 0.02). Antibody response and shedding on-farm had no significant association with isolation of Salmonella from tissues harvested at slaughter. The variation in Salmonella seropositivity due to farm was 28.9% of total variation. These findings indicate that on-farm intervention may be a more effective approach to control Salmonella and to reduce the presence of Salmonella at slaughter. Additionally, the observation that some pigs in this study were Salmonella-negative throughout production and at slaughter is promising with regard to food safety, and studies are needed to explore the genotypes of those pigs.
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Affiliation(s)
- Corinne H Schut
- 1 Department of Pathobiology and University of Guelph , Guelph, Canada
| | - Abdolvahab Farzan
- 1 Department of Pathobiology and University of Guelph , Guelph, Canada .,2 Department of Population Medicine, University of Guelph , Guelph, Canada
| | | | | | - Brandon N Lillie
- 1 Department of Pathobiology and University of Guelph , Guelph, Canada
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15
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Ainslie-Garcia MH, Farzan A, Newman JE, Friendship RM, Lillie BN. Salmonella fecal shedding in pigs from birth to market and its association with the presence of Salmonella in palatine tonsils and submandibular lymph nodes at slaughter. CANADIAN JOURNAL OF VETERINARY RESEARCH = REVUE CANADIENNE DE RECHERCHE VETERINAIRE 2018; 82:249-255. [PMID: 30363385 PMCID: PMC6168018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 02/28/2018] [Indexed: 06/08/2023]
Abstract
Salmonella is an important cause of foodborne illnesses in humans. Food-producing animals, including swine, are a major source of Salmonella in food products. This study investigated on farm Salmonella fecal shedding in pigs at different production stages - from weaning to marketing - and its association with the presence of Salmonella in tissues at slaughter. Fourteen groups from 8 commercial farrowing sources (N = 809 pigs) were monitored 5 times from birth to slaughter. Fecal and tissue samples were collected from pigs and cultured for Salmonella. A survey was conducted to collect farm management information. A multi-level mixed-effects logistic regression modelling method was used to analyze Salmonella shedding over time and the association between Salmonella shedding and the presence of Salmonella in tissue samples. Salmonella was recovered from 13% (421/3339) of fecal samples collected from 809 pigs over the course of the study. Overall, 35% (284) of pigs shed Salmonella at least once, while 12% (99) shed more than once. Salmonella shedding increased as pigs aged (P = 0.01) and increased in the summer months (P < 0.01). Salmonella was isolated from tissue samples collected from 23% (134/580) of pigs; however, the presence of Salmonella at slaughter was not associated with on farm shedding. The seasonal trend in Salmonella shedding and its association with age may be used to identify high-risk groups and implement more effective control measures accordingly. The identification of repeat shedders warrants interventions that target this source of infection on swine farms.
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Affiliation(s)
- Margaret H Ainslie-Garcia
- Department of Pathobiology (Ainslie-Garcia, Farzan, Newman, Lillie) and Department of Population Medicine (Farzan, Newman, Friendship), University of Guelph, Guelph, Ontario N1G 2W1
| | - Abdolvahab Farzan
- Department of Pathobiology (Ainslie-Garcia, Farzan, Newman, Lillie) and Department of Population Medicine (Farzan, Newman, Friendship), University of Guelph, Guelph, Ontario N1G 2W1
| | - Jane E Newman
- Department of Pathobiology (Ainslie-Garcia, Farzan, Newman, Lillie) and Department of Population Medicine (Farzan, Newman, Friendship), University of Guelph, Guelph, Ontario N1G 2W1
| | - Robert M Friendship
- Department of Pathobiology (Ainslie-Garcia, Farzan, Newman, Lillie) and Department of Population Medicine (Farzan, Newman, Friendship), University of Guelph, Guelph, Ontario N1G 2W1
| | - Brandon N Lillie
- Department of Pathobiology (Ainslie-Garcia, Farzan, Newman, Lillie) and Department of Population Medicine (Farzan, Newman, Friendship), University of Guelph, Guelph, Ontario N1G 2W1
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16
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Ström G, Albihn A, Jinnerot T, Boqvist S, Andersson-Djurfeldt A, Sokerya S, Osbjer K, San S, Davun H, Magnusson U. Manure management and public health: Sanitary and socio-economic aspects among urban livestock-keepers in Cambodia. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 621:193-200. [PMID: 29179075 DOI: 10.1016/j.scitotenv.2017.11.254] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 11/21/2017] [Accepted: 11/22/2017] [Indexed: 06/07/2023]
Abstract
Livestock manure is a valuable source of nutrients for crop production, but can also pose a public health hazard and have negative environmental impacts. This study investigated manure management practices among urban and peri-urban livestock keepers in Cambodia, to identify risk behaviours and socio-economic aspects associated with the handling of manure. A survey including 204 households was conducted, using a structured questionnaire with questions on demographics, socio-economic characteristics and household practices related to manure management. Faecal samples were obtained from pig pens and pig manure storage units for analysis of the potential zoonotic pathogens Salmonella enterica (Polymerase Chain Reaction (PCR)), Ascaris suum and Trichuris suis (McMaster flotation technique). The survey revealed a difference in management between cattle and pig manure. Cattle manure was most commonly used as fertiliser for crop production (66%) (p<0.001), whereas pig manure was most commonly dumped in the environment (46%) (p<0.001). Logistic regression models showed that households with a lower socio-economic position were more likely to dump pig manure (p<0.001), with scarcity of agricultural land (p<0.001) and lack of carts for transportation of manure (p<0.01) being identified as contributing factors. Salmonella enterica was detected in 9.7% of manure samples, while Ascaris suum and Trichuris suis were detected in 1.6% and 2.4% of the samples, respectively. The results presented in this study indicate that manure management by urban and peri-urban households may pose a public health threat and an environmental hazard. There is evidently a need for further knowledge support to the livestock keepers to promote good management practices.
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Affiliation(s)
- Gunilla Ström
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, PO Box 7054, 750 07 Uppsala, Sweden.
| | - Ann Albihn
- Department of Chemistry, Environment and Feed Hygiene, National Veterinary Institute, Ulls väg 2B, SE-751 89 Uppsala, Sweden; Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, PO Box 7036, 750 07 Uppsala, Sweden.
| | - Tomas Jinnerot
- Department of Microbiology, Section for Molecular Diagnostics, National Veterinary Institute, Ulls väg 2B, SE-751 89 Uppsala, Sweden.
| | - Sofia Boqvist
- Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, PO Box 7036, 750 07 Uppsala, Sweden.
| | | | - Seng Sokerya
- Centre for Livestock and Agriculture Development, PO Box 2423, Phnom Penh 3, Cambodia.
| | - Kristina Osbjer
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, PO Box 7054, 750 07 Uppsala, Sweden.
| | - Sorn San
- National Veterinary Research Institute, St 371, Phnom Penh, Cambodia
| | - Holl Davun
- National Veterinary Research Institute, St 371, Phnom Penh, Cambodia
| | - Ulf Magnusson
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, PO Box 7054, 750 07 Uppsala, Sweden.
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17
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Nair S, Farzan A, O'Sullivan TL, Friendship RM. Time course of Salmonella shedding and antibody response in naturally infected pigs during grower-finisher stage. CANADIAN JOURNAL OF VETERINARY RESEARCH = REVUE CANADIENNE DE RECHERCHE VETERINAIRE 2018; 82:139-145. [PMID: 29755194 PMCID: PMC5914076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Accepted: 09/28/2017] [Indexed: 06/08/2023]
Abstract
A longitudinal trial was conducted to determine the course of Salmonella shedding and antibody response in naturally infected grower-finisher pigs. Ten-week-old pigs (n = 45) were transferred from a farm with history of salmonellosis and housed at a research facility. Weekly fecal samples (weeks 1 to 11) as well as tissue samples at slaughter were cultured for Salmonella. Serum samples were tested for presence of Salmonella antibody by enzyme-linked immunosorbent assay (ELISA). Data were analyzed using a multilevel mixed-effects logistic regression model. Over 10 wk, 91% and 9% of pigs shed Salmonella ≤ 4 and > 5 times, respectively. The estimated median of Salmonella shedding duration was 3 to 4 wk but some pigs shed Salmonella for up to 8 wk. Salmonella shedding increased 1 wk post-arrival but followed a decreasing pattern afterwards up to week 11 (P < 0.05). Salmonella isolates (n = 29), which were recovered from 18 pigs at different occasions, were S. Typhimurium (28%), S. Livingstone (21%), S. Infantis (14%), S. Montevideo (7%), S. Benfica (3%), S. Amsterdam (3%), S. Senftenberg (17%), and S. I:Rough-O (7%). Of 11 pigs from which the first and last isolates were serotyped, 10 pigs were reinfected with a different serotype. At slaughter, Salmonella was isolated from 7 pigs, of which 5 (71%) had not tested positive for at least 7 wk prior to slaughter. Antibody response peaked 4 wk after the peak of Salmonella infection; Salmonella shedding reduced as antibody response elevated (P < 0.05). These findings indicate that pigs may shed Salmonella into the mid-point of the grower-finisher stage and may be reinfected with different serotypes.
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Affiliation(s)
- Saranya Nair
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1
| | - Abdolvahab Farzan
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1
| | - Terry L O'Sullivan
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1
| | - Robert M Friendship
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1
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18
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Lynch H, Walia K, Leonard FC, Lawlor PG, Manzanilla EG, Grant J, Duffy G, Gardiner GE, Cormican M, King J, Markey BK, Fanning S, Argüello H. Salmonellain breeding pigs: Shedding pattern, transmission of infection and the role of environmental contamination in Irish commercial farrow-to-finish herds. Zoonoses Public Health 2017; 65:e196-e206. [DOI: 10.1111/zph.12428] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Indexed: 11/29/2022]
Affiliation(s)
- H. Lynch
- Teagasc, Food Research Centre; Ashtown Ireland
- UCD Veterinary Sciences Centre; University College Dublin; Dublin Ireland
| | - K. Walia
- Teagasc, Food Research Centre; Ashtown Ireland
- Department of Science; Waterford Institute of Technology; Waterford Ireland
| | - F. C. Leonard
- UCD Veterinary Sciences Centre; University College Dublin; Dublin Ireland
| | - P. G. Lawlor
- Teagasc, Pig Development Department; Fermoy, Co. Cork Ireland
| | | | - J. Grant
- Teagasc, Food Research Centre; Ashtown Ireland
| | - G. Duffy
- Teagasc, Food Research Centre; Ashtown Ireland
| | - G. E. Gardiner
- Department of Science; Waterford Institute of Technology; Waterford Ireland
| | - M. Cormican
- School of Medicine; National University of Ireland Galway; Galway Ireland
| | - J. King
- National Salmonella Shigella Listeria Reference Laboratory Service; Galway University Hospital; Galway Ireland
| | - B. K. Markey
- UCD Veterinary Sciences Centre; University College Dublin; Dublin Ireland
| | - S. Fanning
- UCD Veterinary Sciences Centre; University College Dublin; Dublin Ireland
| | - H. Argüello
- Teagasc, Food Research Centre; Ashtown Ireland
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19
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BONARDI S. Salmonella in the pork production chain and its impact on human health in the European Union. Epidemiol Infect 2017; 145:1513-1526. [PMID: 28241896 PMCID: PMC9203350 DOI: 10.1017/s095026881700036x] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 12/19/2016] [Accepted: 02/01/2017] [Indexed: 11/05/2022] Open
Abstract
Salmonella spp. comprise the second most common food-borne pathogens in the European Union (EU). The role of pigs as carriers of Salmonella has been intensively studied both on farm and at slaughter. Salmonella infection in pigs may cause fever, diarrhoea, prostration and mortality. However, most infected pigs remain healthy carriers, and those infected at the end of the fattening period could pose a threat to human health. Contamination of pig carcasses can occur on the slaughter line, and it is linked to cross-contamination from other carcasses and the presence of Salmonella in the environment. Therefore, Salmonella serovars present on pig carcasses can be different from those detected in the same bathes on the farm. In recent years, S. Typhimurium, S. Derby and S. serotype 4,[5],12:i:- (a monophasic variant of S. Typhimurium) have been the most common serovars to be detected in pigs in EU countries, but S. Rissen, S. Infantis, S. Enteritidis and S. Brandenburg have also been reported. In humans, several cases of salmonellosis have been linked to the consumption of raw or undercooked pork and pork products. Among the main serovars of porcine origin detected in confirmed human cases, S. Typhimurium, the monophasic variant S. 4,[5],12:i:- and S. Derby are certainly the most important.
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Affiliation(s)
- S. BONARDI
- Department of Veterinary Science, Unit of Food Inspection, University of Parma, Via del Taglio 10, 43126 Parma, Italy
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20
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Diseases of the Alimentary Tract. Vet Med (Auckl) 2017. [PMCID: PMC7167529 DOI: 10.1016/b978-0-7020-5246-0.00007-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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21
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Longitudinal study of Salmonella 1,4,[5],12:i:- shedding in five Australian pig herds. Prev Vet Med 2016; 136:19-28. [PMID: 28010904 DOI: 10.1016/j.prevetmed.2016.11.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 10/10/2016] [Accepted: 11/09/2016] [Indexed: 11/24/2022]
Abstract
The shedding patterns of Salmonella spp. and MLVA profiles of Salmonella enterica subspecies enterica (I) serotype 1,4,[5],12:i:- were monitored in a 12-month longitudinal observational study of five pig herds to inform management; provide indications of potential hazard load at slaughter; and assist evaluation of MLVA for use by animal and public health practitioners. Twenty pooled faecal samples, stratified by age group, were collected quarterly. When Salmonella was cultured, multiple colonies were characterized by serotyping and where S. Typhimurium-like serovars were confirmed, isolates were further characterized by phage typing and multiple locus variable number tandem repeat analysis (MLVA). Salmonella was detected in 43% of samples. Salmonella 1,4,[5],12:i- was one of several serovars that persisted within the herds and was found among colonies from each production stage. Virtually all Salmonella 1,4,[5],12:i:- isolates were phage type 193, but exhibited 12 different, closely-related MLVA profiles. Salmonella 1,4,[5],12:i:- diversity within herds was low and MLVA profiles were stable indicating colonization throughout the herds and suggesting each farm had an endemic strain. High prevalence of S. 1,4,[5],12:i:- specific shedding among terminal animals indicated high hazard load at slaughter, suggesting that primary production may be an important pathway of S. 1,4,[5],12:i:- into the human food chain, this has implications for on-farm management and the application and targeting control measures and further evidence of the need for effective process control procedures to be in place during slaughter and in pork boning rooms. These findings have implications for animal health and food safety risk mitigation and risk management.
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22
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Spatial distribution and risk factors associated with Salmonella enterica in pigs. Epidemiol Infect 2016; 145:568-574. [DOI: 10.1017/s0950268816002612] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
SUMMARYThe importance of pork in the transmission of Salmonella spp. to humans has led to the development of control programmes worldwide. For this, knowledge on the epidemiology of the infection in the production system is fundamental to the efficacy of the regulations. Our objective was to determine the prevalence and spatial distribution of Salmonella-infected farms in the central region of Argentina, and to identify the predominant serotypes and epidemiological factors associated with an increased risk of infection. Salmonella was isolated from 22 of 52 sampled farms, for a farm prevalence of 42·3% (95% confidence interval 28·4–56·1). The most frequent serotypes isolated were S. Typhimurium and S. Derby, which have often been considered of public health concern in the region. Limited evidences of global and local clustering in the region under study were found, and the type of feed and presence of diarrhoeic pigs were significantly associated with having Salmonella shedders in the farm. This highlights the need to evaluate microbiological controls at the farm level, and demonstrates the usefulness of the spatial tools to identify areas of greatest risk when processing pork at slaughterhouse, which could contribute to increasing the food safety of pork products.
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Bearson SMD, Bearson BL, Loving CL, Allen HK, Lee I, Madson D, Kehrli ME. Prophylactic Administration of Vector-Encoded Porcine Granulocyte-Colony Stimulating Factor Reduces Salmonella Shedding, Tonsil Colonization, and Microbiota Alterations of the Gastrointestinal Tract in Salmonella-Challenged Swine. Front Vet Sci 2016; 3:66. [PMID: 27610361 PMCID: PMC4996822 DOI: 10.3389/fvets.2016.00066] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 08/08/2016] [Indexed: 11/25/2022] Open
Abstract
Salmonella colonization of food animals is a concern for animal health and public health as a food safety risk. Various obstacles impede the effort to reduce asymptomatic Salmonella carriage in food animals, including the existence of numerous serovars and the ubiquitous nature of Salmonella. To develop an intervention strategy that is non-specific yet effective against diverse Salmonella serovars, we explored the prophylactic use of a cytokine to decrease Salmonella in swine by boosting the host’s innate immune system. Granulocyte-colony stimulating factor (G-CSF) is the major cytokine regulating the production, differentiation, function, and survival of neutrophils. Neutrophils play a critical role in the response to Salmonella; therefore, we evaluated the vectored-delivery of porcine G-CSF as a prophylactic to reduce Salmonella in pigs. Crossbred pigs, 5 weeks of age, were intramuscularly injected with a replication-defective human adenovirus (Ad5) engineered to express porcine G-CSF (Ad5-G-CSF, n = 9). Control pigs received the same Ad5 vector lacking the gene encoding G-CSF (Ad5-empty, n = 7). Four days later, all pigs (n = 16) were intranasally inoculated with 1 × 107 colony forming unit (CFU) of Salmonella enterica serovar Typhimurium UK1. At 2 and 3 days post-challenge with Salmonella, Ad5-G-CSF-treated pigs shed significantly less Salmonella (~103 CFU/g) in their feces than Ad5-empty-treated pigs (~104–105 CFU/g; P < 0.05). A significant 4-log reduction in tonsil colonization was also observed in the Ad5-G-CSF-treated pigs at 7 days post-challenge (P < 0.05). In the gastrointestinal tract, the Peyer’s patch region of the ileum exhibited a significant 0.5-log reduction in colonization in the Ad5-G-CSF-treated pigs (P < 0.05). The microbiota of all challenged pigs was assessed by sequencing and analyzing the V1–V3 region of the 16S rRNA gene from fecal DNA samples. The microbial community structure of Salmonella-challenged pigs was less disturbed post-challenge in the Ad5-G-CSF-treated pigs than the Ad5-empty-treated pigs. This suggests that Ad5-G-CSF administration mitigated changes in the microbial community structure caused by Salmonella challenge. Collectively, these data suggest that delivery of a targeted immunostimulant to enhance neutropoiesis may be a strategy to reduce Salmonella colonization, potentially during periods of immunological stress.
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Affiliation(s)
- Shawn M D Bearson
- Food Safety and Enteric Pathogens Research Unit, National Animal Disease Center, ARS, USDA , Ames, IA , USA
| | - Bradley L Bearson
- Agroecosystems Management Research Unit, National Laboratory for Agriculture and the Environment, ARS, USDA , Ames, IA , USA
| | - Crystal L Loving
- Food Safety and Enteric Pathogens Research Unit, National Animal Disease Center, ARS, USDA , Ames, IA , USA
| | - Heather K Allen
- Food Safety and Enteric Pathogens Research Unit, National Animal Disease Center, ARS, USDA , Ames, IA , USA
| | - InSoo Lee
- Department of Biological Sciences and Biotechnology, Hannam University , Daejeon , South Korea
| | - Darin Madson
- Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University , Ames, IA , USA
| | - Marcus E Kehrli
- Food Safety and Enteric Pathogens Research Unit, National Animal Disease Center, ARS, USDA , Ames, IA , USA
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24
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Casanova-Higes A, Andrés-Barranco S, Mainar-Jaime RC. Influence of On-farm pig Salmonella status on Salmonella Shedding at Slaughter. Zoonoses Public Health 2016; 64:328-336. [PMID: 27549508 DOI: 10.1111/zph.12301] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Indexed: 11/28/2022]
Abstract
The risk of Salmonella shedding among pigs at slaughter with regard to their previous on-farm Salmonella status was assessed in a group of pigs from a farm from NE of Spain. A total of 202 pigs that had been serologically monitored monthly during the fattening period and from which mesenteric lymph nodes (MLN) and faecal (SFEC) samples were collected at slaughter for Salmonella isolation were included. A repeated-measures anova was used to assess the relationship between mean OD% values during the fattening period and sampling time and bacteriology on MLN and SFEC. Pigs were also grouped into four groups, that is pigs seronegative during the fattening period and Salmonella negative in MLN (group A; n = 69); pigs seronegative during the fattening period but Salmonella positive in MLN (B; n = 36); pigs seropositive at least once and Salmonella positive in MLN (C; n = 50); and pigs seropositive at least once but Salmonella negative in (D; n = 47). Pigs shedding at slaughter seroconverted much earlier and showed much higher mean OD% values than non-shedders pigs. The proportion of Salmonella shedders in groups A and D was high and similar (26.1% and 29.8%, respectively), but significantly lower than that for groups B and C. The odds of shedding Salmonella for groups B and C were 4.8 (95% CI = 1.5-15.5) and 20.9 (3.7-118) times higher, respectively, when compared to A. It was concluded that a large proportion of Salmonella seronegative pigs may shed Salmonella at slaughter, which would be likely associated to previous exposure with contaminated environments (i.e. transport and lairage). For pigs already infected at farm, the likelihood of shedding Salmonella was much higher and may depend on whether the bacterium has colonized the MLN or not. The odds of shedding Salmonella spp. were always much higher for pigs in which Salmonella was isolated from MLN.
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Affiliation(s)
- A Casanova-Higes
- Unidad de Producción y Sanidad Animal, Centro de Investigación y Tecnología Agroalimentaria de Aragón, Instituto Agroalimentario de Aragón -IA2- (CITA-Universidad de Zaragoza), Zaragoza, Spain
| | - S Andrés-Barranco
- Unidad de Producción y Sanidad Animal, Centro de Investigación y Tecnología Agroalimentaria de Aragón, Instituto Agroalimentario de Aragón -IA2- (CITA-Universidad de Zaragoza), Zaragoza, Spain
| | - R C Mainar-Jaime
- Dpt. de Patología Animal, Facultad de Veterinaria, Instituto Agroalimentario de Aragón -IA2- (Universidad de Zaragoza-CITA), Zaragoza, Spain
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25
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Likavec T, Pires AF, Funk JA. Association between thermal environment and Salmonella in fecal samples from dairy cattle in midwestern United States. CANADIAN JOURNAL OF VETERINARY RESEARCH = REVUE CANADIENNE DE RECHERCHE VETERINAIRE 2016; 80:183-188. [PMID: 27408330 PMCID: PMC4924551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 02/10/2016] [Indexed: 06/06/2023]
Abstract
The objective of this study was to describe the association between thermal measures in the barn environment (pen temperature and humidity) and fecal shedding of Salmonella in dairy cattle. A repeated cross-sectional study was conducted within a commercial dairy herd located in the midwestern United States. Five pooled fecal samples were collected monthly from each pen for 9 mo and submitted for microbiological culture. Negative binomial regression methods were used to test the association [incidence rate ratio (IRR)] between Salmonella pen status (the count of Salmonella-positive pools) and thermal environmental parameters [average temperature and temperature humidity index (THI)] for 3 time periods (48 h, 72 h, and 1 wk) before fecal sampling. Salmonella was cultured from 10.8% [39/360; 95% confidence interval (CI): 7.8% to 14.5%] of pooled samples. The highest proportion of positive pools occurred in August. The IRR ranged from 1.26 (95% CI: 1.15 to 1.39, THI 1 wk) to 4.5 (95% CI: 2.13 to 9.51, heat exposure 1 wk) across all thermal parameters and lag time periods measured. For example, the incidence rate of Salmonella-positive pools increased by 54% for every 5°C increment in average temperature (IRR = 1.54; 95% CI: 1.29 to 1.85) and 29% for every 5-unit increase in THI (IRR = 1.29; 95% CI: 1.16 to 1.42) during the 72 h before sampling. The incidence rate ratio for pens exposed to higher temperatures (> 25°C) was 4.5 times (95% CI: 2.13 to 9.51) the incidence rate ratio for pens exposed to temperatures < 25°C in the 72 h before sampling. Likewise, the incidence rate ratio for pens exposed to THI > 70 was 4.23 times greater (95% CI: 2.1 to 8.28) than when the THI was < 70 in the 72 h before sampling. An association was found between the thermal environment and Salmonella shedding in dairy cattle. Further research is warranted in order to fully understand the component risks associated with the summer season and increased Salmonella shedding.
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Affiliation(s)
| | - Alda F.A. Pires
- Address all correspondence to Dr. Alda F.A. Pires; telephone: (530) 754-9855; fax: (530) 752-7181; e-mail:
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26
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Pires AFA, Funk JA, Habing GG, Bolin C. Phenotypic and Genotypic Diversity of Salmonella in Finishing Swine. Foodborne Pathog Dis 2016; 13:182-9. [PMID: 26977814 DOI: 10.1089/fpd.2015.2012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Salmonella enterica (nontyphoidal) is one of the major causes of foodborne diseases in the United States and worldwide. Molecular typing methods are significant tools used to better understand the transmission and ecology of Salmonella in order to implement pre-harvest control measures. The objectives of this study were to describe the Salmonella genotypes, the distribution of isolate subtypes from different ecological niches (i.e., barn environment, nursery, and individual pigs) and their evolution over time in a longitudinal study conducted in three finishing sites (housing pigs from 10 weeks of age until slaughter at 24-26 weeks of age). Among the 107 Salmonella isolates submitted for pulsed-field gel electrophoresis (PFGE) analysis, there were 25 distinct subtypes. PFGE genotyping results were consistent with the serotype findings. A large number of distinguishable PFGE patterns (i.e., within the same serovar) were observed and different combinations of subtypes were identified within and across sites and cohorts. New subtypes may result of the introduction of new strains, genetic changes, or ongoing transmission of evolved strains within the production system. The same subtypes were detected intermittently during the study period, which suggests the persistence of indistinguishable subtypes in this production system. In addition, this study suggests persistence of the same subtype over several cohorts of pigs and potential residual contamination from the barn. Factors affecting adaptation and transmission of Salmonella within and among ecological systems (e.g., finishing pigs, nursery, and environment) should be further investigated. Understanding genotypic diversity of Salmonella in different ecological niches during pre-harvest may contribute to the development of more targeted and cost effective control programs during nursery and finishing phases.
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Affiliation(s)
- Alda F A Pires
- 1 Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University , East Lansing, Michigan
| | - Julie A Funk
- 1 Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University , East Lansing, Michigan
| | - Greg G Habing
- 2 Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University , Columbus, Ohio
| | - Carole Bolin
- 3 Diagnostic Center for Population and Animal Health, College of Veterinary Medicine, Michigan State University , East Lansing, Michigan
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27
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Foster N, Richards L, Higgins J, Kanellos T, Barrow P. Oral vaccination with a rough attenuated mutant of S. Infantis increases post-wean weight gain and prevents clinical signs of salmonellosis in S. Typhimurium challenged pigs. Res Vet Sci 2016; 104:152-9. [PMID: 26850554 DOI: 10.1016/j.rvsc.2015.12.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 12/21/2015] [Accepted: 12/22/2015] [Indexed: 11/16/2022]
Abstract
We show that oral inoculation of 14 day old conventional piglets with a rough attenuated Salmonella enterica serovar Infantis 1326/28Ф(r) (serogroup C1), 24h prior to oral challenge with S. enterica serovar Typhimurium 4/74 (serogroup B), resulted in significant weight gain (~10%) measured at 14 days post-weaning (38 days of age). Two days after challenge the S. Typhimurium induced stunting and, in some cases loss, of villi but this was prevented by pre-inoculation with the S. Infantis strain. The clinical signs of disease associated with S. Typhimurium 4/74 challenge and faecal shedding were also significantly (P<0.05) reduced by pre-inoculation with the S. Infantis mutant. Pre-inoculation of pigs with the S. Infantis mutant also increased weight gain in pigs challenged with pathogenic Escherichia coli. However, Mycobacterium bovis BCG, an unrelated intracellular bacterium, did not protect against challenge with S. Typhimurium 4/74.
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Affiliation(s)
- Neil Foster
- School of Veterinary Medicine and Science, University of Nottingham, Nottingham, UK.
| | - Luke Richards
- School of Veterinary Medicine and Science, University of Nottingham, Nottingham, UK
| | - John Higgins
- School of Veterinary Medicine and Science, University of Nottingham, Nottingham, UK
| | | | - Paul Barrow
- School of Veterinary Medicine and Science, University of Nottingham, Nottingham, UK
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28
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Rasschaert G, Michiels J, Tagliabue M, Missotten J, De Smet S, Heyndrickx M. Effect of Organic Acids on Salmonella Shedding and Colonization in Pigs on a Farm with High Salmonella Prevalence. J Food Prot 2016; 79:51-8. [PMID: 26735029 DOI: 10.4315/0362-028x.jfp-15-183] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This study builds on the results of a previous study in which six commercial feed products based on organic acids were evaluated with respect to Salmonella contamination of piglets in an artificially challenged seeder model. In the present study, the efficacy of three of these commercial products was assessed for Salmonella reduction in fattening pigs on one closed farm with a natural high Salmonella prevalence. In each of four fattening compartments, one of the following feed treatments was evaluated during two consecutive fattening rounds: (i) butyric acid (active ingredients at 1.3 kg/ton of feed; supplement A1), (ii) a combination of short-chain organic acids (mixture of free acids and salts) and natural extracts (2.92 kg/ton; supplement A4), (iii) a 1:1 blend of two commercial products consisting of medium-chain fatty acids, lactic acid, and oregano oil (3.71 kg/ton; supplement A5+A6), and (iv) a control feed. On the farm, the Salmonella status of the fattening pigs was evaluated by taking fecal samples twice during the fattening period. At the slaughterhouse, samples were collected from the cecal contents and the ileocecal lymph nodes. Salmonella isolates were serotyped and characterized by pulsed-field gel electrophoresis. This farm had a particularly high number of pigs shedding Salmonella with a wide variety of sero- and pulsotypes. Only the feed blend based on the medium-chain fatty acids was able to significantly reduce Salmonella prevalence both on the farm and at the slaughterhouse. With this combined supplement, the Salmonella reduction in the feces at slaughter age, in cecal contents at slaughter, and the lymph nodes was 50, 36, and 67%, respectively, compared with the control animals. This promising finding calls for further investigation including cost-efficiency of this combined feed product and its effect on the animals.
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Affiliation(s)
- G Rasschaert
- Technology and Food Science Unit, Institute for Agricultural and Fisheries Research, Brusselsesteenweg 370, 9090 Melle, Belgium.
| | - J Michiels
- Department of Applied Biosciences, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyckweg 1, 9000 Gent, Belgium
| | - M Tagliabue
- Laboratory for Animal Nutrition and Animal Product Quality, Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Proefhoevestraat 10, 9090 Melle, Belgium
| | - J Missotten
- Laboratory for Animal Nutrition and Animal Product Quality, Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Proefhoevestraat 10, 9090 Melle, Belgium
| | - S De Smet
- Laboratory for Animal Nutrition and Animal Product Quality, Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Proefhoevestraat 10, 9090 Melle, Belgium
| | - M Heyndrickx
- Technology and Food Science Unit, Institute for Agricultural and Fisheries Research, Brusselsesteenweg 370, 9090 Melle, Belgium; Department of Pathology, Bacteriology, and Poultry Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
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29
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Andres VM, Davies RH. Biosecurity Measures to Control Salmonella and Other Infectious Agents in Pig Farms: A Review. Compr Rev Food Sci Food Saf 2015. [DOI: 10.1111/1541-4337.12137] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Victor M. Andres
- Bacteriology, Animal and Plant Health Agency; New Haw Addlestone Surrey KT15 3NB UK
| | - Rob H. Davies
- Bacteriology, Animal and Plant Health Agency; New Haw Addlestone Surrey KT15 3NB UK
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30
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Andrés-Barranco S, Vico J, Grilló M, Mainar-Jaime R. Reduction of subclinical Salmonella
infection in fattening pigs after dietary supplementation with a ß-galactomannan oligosaccharide. J Appl Microbiol 2014; 118:284-94. [DOI: 10.1111/jam.12713] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 11/26/2014] [Accepted: 11/27/2014] [Indexed: 11/27/2022]
Affiliation(s)
- S. Andrés-Barranco
- Centro de Investigación y Tecnología Agroalimentaria de Aragón; Zaragoza Spain
| | - J.P. Vico
- Facultad de Ciencias Agropecuarias; Universidad Católica de Córdoba; Córdoba Argentina
| | - M.J. Grilló
- Instituto de Agrobiotecnología (CSIC-UPNA-Gobierno de Navarra); Pamplona Spain
| | - R.C. Mainar-Jaime
- Departamento de Patología Animal. Facultad de Veterinaria; Universidad de Zaragoza; Zaragoza Spain
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31
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Evaluation of the sensitivity of faecal sampling for detection of monophasic Salmonella Typhimurium and other Salmonella in cattle and pigs. Epidemiol Infect 2014; 143:1681-91. [PMID: 25266772 DOI: 10.1017/s0950268814002453] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
There has been a rapid rise in the prevalence of cases of monophasic Salmonella Typhimurium (mST) in both humans and farm animals, and it has been found in pigs, cattle and poultry. It is therefore vital to have a good understanding of how to efficiently detect infected farms. The objective of this project was to determine sample type sensitivity in the detection of Salmonella to detect infected groups of animals on both pig (breeder, grower and finisher sites) and cattle (beef and dairy) farms, using data collected from a study investigating farms that were positive for mST, and to explore any variation between different age groups and management practices. A Bayesian approach in the absence of a gold standard was adopted to analyse the individual and pooled faecal sample data collected from each epidemiological group on each of the farms. The sensitivity of pooled sampling depended on the prevalence of infection in the group being sampled, with a higher prevalence leading to higher sensitivity. Pooled sampling was found to be more efficient at detecting positive groups of animals than individual sampling, with the probability of a random sample from a group of animals with 5% prevalence testing positive being equal to 15·5% for immature pigs (3·6% for an individual faecal sample, taking into account the sensitivity and infection prevalence), 7·1% for adult pigs (1·2% for individual sampling), 30% for outdoor cattle (2% for individual sampling) and 34% for indoor cattle (1% for individual sampling). The mean prevalence of each epidemiological group was higher in outdoor farms than indoor for both pigs and cattle (mean within-farm prevalence of 29·4% and 38·7% for outdoor pigs and cattle, respectively, compared to 19·8% and 22·1% for indoor pigs and cattle).
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32
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Risk factors associated with persistence of Salmonella shedding in finishing pigs. Prev Vet Med 2014; 116:120-8. [PMID: 25005468 DOI: 10.1016/j.prevetmed.2014.06.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 06/05/2014] [Accepted: 06/17/2014] [Indexed: 11/21/2022]
Abstract
The objective of this study was to identify risk factors associated with persistence of Salmonella shedding in finishing swine. A longitudinal study was conducted in 18 cohorts of pigs from three finishing sites of one swine production company. Among the 446 Salmonella isolates (isolated from 187 pigs), there were 18 distinct serovars. The six most common serovars were S. enterica serovar Derby (47.3%), S. Agona (27.4%), S. Johannesburg (10.5%), S. Schwarzengrund (2.7%), S. Litchfield (2.5%) and S. Mbandaka (2.2%). Survival analysis techniques, Kaplan-Meier methods and Log-rank test were used to estimate the duration of Salmonella shedding in days and to evaluate differences in shedding associated with risk factors at different organizational levels: isolate (serovar), pig, cohort and site. The risk factors at the pig-level were: sex, age and individual health status; and the risk factors at the cohort-level were: health risk, treatment and "at risk pigs" proportions, nursery and barn environment Salmonella status and prior exposure to the same serovar in the nursery or barn environment. Survival analysis using acceleration failure time models, with a log-normal distribution, was applied to investigate risk factors associated with Salmonella persistence (175 pigs) and serovar-specific persistence (151 pigs) during the study period. Pigs detected Salmonella positive for the first time at 10 weeks of age had a longer duration of shedding, than pigs first detected at an older age. The duration of shedding was shorter among pigs infected with S. Derby, S. Johannesburg and other serovars as compared to pigs infected with S. Agona. A significant difference was observed among sites. Cohorts with pig treatment proportions greater than the median were more likely to have a shorter duration of Salmonella shedding. Pigs from cohorts with nursery positive pools greater than the overall mean had a longer duration of Salmonella shedding as compared to pigs from cohorts with nursery pools less than or equal to the mean. These results suggest that the duration of Salmonella shedding may depend on Salmonella serovar, pig age at the time of infection, farm site and cohort-level risk factors. Identification of risk factors associated with the duration of shedding may allow more targeted interventions for the control Salmonella by evaluation of control measures not only for prevalence reduction, but also to decrease the duration of shedding. Such measures may decrease the risk of contamination of pork and subsequent risk of foodborne illness.
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33
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Pires AF, Funk JA, Lim A, Bolin SR. Enumeration ofSalmonellain Feces of Naturally Infected Pigs. Foodborne Pathog Dis 2013; 10:933-7. [DOI: 10.1089/fpd.2013.1547] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Alda F.A. Pires
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
| | - Julie A. Funk
- Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
| | - Ailam Lim
- Diagnostic Center for Population and Animal Health, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
| | - Steven R. Bolin
- Diagnostic Center for Population and Animal Health, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
- Department of Pathobiology and Diagnostic Investigation, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan
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