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Microencapsulated Bacteriophages Incorporated in Feed for Salmonella Control in Broilers. Vet Microbiol 2022; 274:109579. [DOI: 10.1016/j.vetmic.2022.109579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 09/05/2022] [Accepted: 09/27/2022] [Indexed: 11/21/2022]
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2
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Núncio ASP, Webber B, Pottker ES, Cardoso B, Esposito F, Fontana H, Lincopan N, Girardello R, Pilotto F, dos Santos LR, Rodrigues LB. Genomic characterization of multidrug-resistant Salmonella Heidelberg E2 strain isolated from chicken carcass in southern Brazil. Int J Food Microbiol 2022; 379:109863. [DOI: 10.1016/j.ijfoodmicro.2022.109863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 02/09/2022] [Accepted: 07/27/2022] [Indexed: 10/16/2022]
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3
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Herawati H, Anisa AK, Widiatmoko KD, Alam SSP, Diari IA, Naprila ZH, Kisya RLA, Puspabela A, Permata FS. Effect of red ginger powder (Zingiber officinale var. rubrum) as a feed additive for starter and finisher broiler chicken to increase immunoglobulin A and immunoglobulin Y expression and to prevent intestinal injury due to Salmonella enteritidis infection. Vet World 2022; 15:1506-1514. [PMID: 35993070 PMCID: PMC9375218 DOI: 10.14202/vetworld.2022.1506-1514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 04/28/2022] [Indexed: 12/03/2022] Open
Abstract
Background and Aim: Salmonellosis is an infectious disease that often occurs in chickens and is caused by Salmonella enteritidis. The use of antibiotics to prevent this disease can result in the development of resistance in pathogenic bacteria, in addition to the presence of antibiotic residues in consumed carcasses. Red ginger (Zingiber officinale var. rubrum) has active compounds that potentially act as immunomodulators which increase specific and non-specific immune responses through the induction of cytokine production. This study was conducted to determine the effects of red ginger powder mixed in feed for starter and finisher broiler chickens, based on the evaluation of the expression of immunoglobulin A (IgA), histopathologic description of the ileum and cecum, IgA, and immunoglobulin Y (IgY) expression in the spleen, and the isolation count of S. enteritidis in fresh fecal samples. Materials and Methods: A total of 100 starter and 100 finisher Cobb broiler chickens were divided into four groups, designated as T0, T1, T2, and T3, respectively: Group T0 was fed commercial feed with no added 2% red ginger powder or S. enteritidis induction, and served as a negative control; Group T1 was inoculated with a 0.25 mL S. enteritidis oral induction (1 × 107 colony-forming unit [CFU] [0.5 McFarland standard]), and served as a positive control; Group T2 was fed with feed containing 2% red ginger powder; while Group T3 was fed with feed containing 2% red ginger powder and was orally inoculated with S. enteritidis with a dose similar to T1. The normal feed was given on the 1st–7th days. The mixture of 2% red ginger powder was given on the 7th–15th days. The S. enteritidis was induced on the 15th day (1 × 107 CFU). Necropsy was performed on the 16th day and tissues were fixed in 10% formalin and routinely processed for histopathologic and immunohistochemical analyses. The data were analyzed using a one-way analysis of variance test, Tukey’s analysis, and the Mann–Whitney U non-parametric statistical analysis test. Results: The 2% red ginger powder was found to significantly (p < 0.05) increase IgA expression and additionally decrease tissue damage in the cecum and ileum. It also increased IgA and IgY expression in the spleen. In addition, a decrease was observed in the S. enteritidis number isolated from finisher fresh feces, but none was found in the isolated starter fresh feces. Conclusion: These findings indicate that the addition of red ginger powder to chicken feed is a potential natural immunomodulator against S. enteritidis infection.
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Affiliation(s)
- Herawati Herawati
- Department of Veterinary Public Health, Faculty of Veterinary Medicine, Universitas Brawijaya, Malang, 65151, Indonesia
| | - Agri Kaltaria Anisa
- Department of Pharmacology, Faculty of Veterinary Medicine, Universitas Brawijaya, Malang, 65151, Indonesia
| | - Kurnianto Dwi Widiatmoko
- Veterinary Science Undergraduate Program, Faculty of Veterinary Medicine Universitas Brawijaya, Malang, 65151, Indonesia
| | - Setiawan Surya Paku Alam
- Veterinary Science Undergraduate Program, Faculty of Veterinary Medicine Universitas Brawijaya, Malang, 65151, Indonesia
| | - Islah Asyraf Diari
- Veterinary Science Undergraduate Program, Faculty of Veterinary Medicine Universitas Brawijaya, Malang, 65151, Indonesia
| | - Zhella Happy Naprila
- Veterinary Science Undergraduate Program, Faculty of Veterinary Medicine Universitas Brawijaya, Malang, 65151, Indonesia
| | - Rr. Lintan Ayu Kisya
- Veterinary Science Undergraduate Program, Faculty of Veterinary Medicine Universitas Brawijaya, Malang, 65151, Indonesia
| | - Analita Puspabela
- Veterinary Science Undergraduate Program, Faculty of Veterinary Medicine Universitas Brawijaya, Malang, 65151, Indonesia
| | - Fajar Shodiq Permata
- Department of Histology, Faculty of Veterinary Medicine, Universitas Brawijaya, Malang, 65151, Indonesia
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Vellano IHB, Milbradt EL, Polizel DM, Oro C, Paz IC, Padovani CR, Gross L, Silva TM, Hataka A, Filho RLA. Comparison of microbiological, pathological and zootechnical aspects between broiler chickens and turkeys challenged with Salmonella Heidelberg. J APPL POULTRY RES 2022. [DOI: 10.1016/j.japr.2022.100266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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5
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El-Saadony MT, Salem HM, El-Tahan AM, Abd El-Mageed TA, Soliman SM, Khafaga AF, Swelum AA, Ahmed AE, Alshammari FA, Abd El-Hack ME. The control of poultry salmonellosis using organic agents: an updated overview. Poult Sci 2022; 101:101716. [PMID: 35176704 PMCID: PMC8857471 DOI: 10.1016/j.psj.2022.101716] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 12/29/2021] [Accepted: 01/05/2022] [Indexed: 02/06/2023] Open
Abstract
Salmonellosis is a severe problem that threatens the poultry sector worldwide right now. Salmonella gallinarium and Salmonella pullorum (Fowl typhoid) are the most pathogenic serovars in avian species leading to systemic infection resulting in severe economic losses in the poultry industry. Nontyphoidal serotypes of Salmonella (Paratyphoid disease) constitute a public health hazard for their involvement in food poisoning problems in addition to their zoonotic importance. Also, Salmonella species distribution is particularly extensive. They resisted environmental conditions that made it difficult to control their spread for a long time. Therefore, the current review aimed to through light on Salmonellosis in poultry with particular references to its pathogenesis, economic importance, immune response to Salmonella, Salmonella antibiotics resistance, possible methods for prevention and control of such problems using promising antibiotics alternatives including probiotics, prebiotics, symbiotics, organic acids, essential oils, cinnamaldehyde, chitosan, nanoparticles, and vaccines.
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Affiliation(s)
- Mohamed T El-Saadony
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
| | - Heba M Salem
- Department of Poultry Diseases, Faculty of Veterinary Medicine, Cairo University 12211, Giza, Egypt
| | - Amira M El-Tahan
- Plant Production Department, Arid Lands Cultivation Research Institute, The City of Scientific Research and Technological Applications, Alexandria, Egypt
| | - Taia A Abd El-Mageed
- Soil and Water Department, Faculty of Agriculture, Fayoum University, Fayoum 63514, Egypt
| | - Soliman M Soliman
- Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University 1221, Giza, Egypt
| | - Asmaa F Khafaga
- Department of Pathology, Faculty of Veterinary Medicine, Alexandria University, Edfina 22758, Egypt
| | - Ayman A Swelum
- Department of Animal production, College of Food and Agriculture Sciences, King Saud University, Riyadh 11451, Saudi Arabia; Department of Theriogenology, Faculty of Veterinary Medicine, Zagazig University, Sharkia 44519, Egypt
| | - Ahmed E Ahmed
- Biology Department, College of Science, King Khalid University 61413 Abha, Saudi Arabia; Department of Theriogenology, Faculty of Veterinary Medicine, South Valley University 83523 Qena, Egypt
| | - Fahdah A Alshammari
- Department of Biology, College of Sciences and Literature, Northern Border University, Rafha 76312, Saudi Arabia
| | - Mohamed E Abd El-Hack
- Poultry Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt.
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6
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Ferreira TS, Ravetti R, Rubio MS, Alves LBR, Saraiva MMS, Benevides VP, Lima TS, Lima BN, Almeida AM, Berchieri Jr A. Inclusion of Organic Acids in the Drinking Water and Feed for the Control of Salmonella Heidelberg in Broilers. BRAZILIAN JOURNAL OF POULTRY SCIENCE 2022. [DOI: 10.1590/1806-9061-2020-1427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- TS Ferreira
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
| | - R Ravetti
- Salmix Indústria e Comércio Ltda, Brazil
| | - MS Rubio
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
| | - LBR Alves
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
| | - MMS Saraiva
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
| | - VP Benevides
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
| | - TS Lima
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
| | - BN Lima
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
| | - AM Almeida
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
| | - A Berchieri Jr
- Universidade Estadual Paulista “Júlio de Mesquita Filho”, Brazil
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Changes in the Microbial Composition of the Cecum and Histomorphometric Analysis of Its Epithelium in Broilers Fed with Feed Mixture Containing Fermented Rapeseed Meal. Microorganisms 2021; 9:microorganisms9020360. [PMID: 33673092 PMCID: PMC7918838 DOI: 10.3390/microorganisms9020360] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/03/2021] [Accepted: 02/09/2021] [Indexed: 01/09/2023] Open
Abstract
This study examined the influence of fermented rapeseed meal (FRSM) on the intestinal morphology and gut microflora of broiler chickens. Limited information is available on the effects of FRSM on the intestinal morphology and the gastrointestinal microbiome population of animals. First, 48 21-day Ross 308 broilers were placed in metabolic cages and randomly assigned to four experimental groups. Group I birds were negative controls and received no additive. Group II birds were positive controls and received a 3% addition of unfermented rapeseed meal. Group III birds received a 3% addition of rapeseed meal fermented with the Bacillus subtilis 67 bacterial strain. Group IV birds received a 3% addition of rapeseed meal fermented with the B. subtilis 87Y strain. After 23 days of experimental feeding, the contents of the birds’ ceca were collected for microorganism determination. The histomorphology of the broilers’ ceca was also determined, and beneficial changes were found in the histology of the broilers’ ceca with the additives. Moreover, these materials inhibited the growth of pathogens and significantly stimulated the growth of probiotic bacteria. These results suggest that the addition of 3% FRSM has a potential probiotic effect and can be used as a material in feed for broilers.
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Perry F, Johnson C, Aylward B, Arsenault RJ. The Differential Phosphorylation-Dependent Signaling and Glucose Immunometabolic Responses Induced during Infection by Salmonella Enteritidis and Salmonella Heidelberg in Chicken Macrophage-like cells. Microorganisms 2020; 8:E1041. [PMID: 32674261 PMCID: PMC7409154 DOI: 10.3390/microorganisms8071041] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 07/10/2020] [Indexed: 12/11/2022] Open
Abstract
Salmonella is a burden to the poultry, health, and food safety industries, resulting in illnesses, food contamination, and recalls. Salmonella enterica subspecies enterica Enteritidis (S. Enteritidis) is one of the most prevalent serotypes isolated from poultry. Salmonella enterica subspecies enterica Heidelberg (S. Heidelberg), which is becoming as prevalent as S. Enteritidis, is one of the five most isolated serotypes. Although S. Enteritidis and S. Heidelberg are almost genetically identical, they both are capable of inducing different immune and metabolic responses in host cells to successfully establish an infection. Therefore, using the kinome peptide array, we demonstrated that S. Enteritidis and S. Heidelberg infections induced differential phosphorylation of peptides on Rho proteins, caspases, toll-like receptors, and other proteins involved in metabolic- and immune-related signaling of HD11 chicken macrophages. Metabolic flux assays measuring extracellular acidification rate (ECAR) and oxygen consumption rate (OCR) demonstrated that S. Enteritidis at 30 min postinfection (p.i.) increased glucose metabolism, while S. Heidelberg at 30 min p.i. decreased glucose metabolism. S. Enteritidis is more invasive than S. Heidelberg. These results show different immunometabolic responses of HD11 macrophages to S. Enteritidis and S. Heidelberg infections.
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Affiliation(s)
| | | | | | - Ryan J. Arsenault
- Department of Animal and Food Sciences, University of Delaware, Newark, DE 19716, USA; (F.P.); (C.J.); (B.A.)
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Acevedo-Villanueva KY, Lester B, Renu S, Han Y, Shanmugasundaram R, Gourapura R, Selvaraj R. Efficacy of chitosan-based nanoparticle vaccine administered to broiler birds challenged with Salmonella. PLoS One 2020; 15:e0231998. [PMID: 32330169 PMCID: PMC7182187 DOI: 10.1371/journal.pone.0231998] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 04/04/2020] [Indexed: 01/14/2023] Open
Abstract
Two experiments were conducted to evaluate the immune response of broilers vaccinated with Salmonella chitosan-nanoparticle (CNP) vaccine and challenged with Salmonella. The Salmonella CNP vaccine was synthesized with Salmonella enterica outer membrane proteins (OMPs) and flagellin proteins. In Experiment I, birds were orally gavaged with PBS or 500, 1000, or 2000μg of CNP vaccine 1 and 7d-of-age. At 14d-of-age, birds were orally challenged with 1 X 105 CFU/bird of live S. Enteritidis (SE). Macrophage-nitrite production 11d-post-challenge was higher (P<0.05) in the 500μg group when compared to the control. At d14 (8h-post-challenge), broilers vaccinated with 1000μg CNP had higher (P<0.05) serum anti-OMPs IgG and IgA and cloacal anti-OMP IgA amounts. At 11d-post-challenge, birds vaccinated with 1000μg CNP vaccine had greater (P<0.05) bile anti-OMP and anti-flagellin IgA amounts. At 11d-post-challenge, birds administered 1000μg CNP vaccine has increased (P<0.05) IL-1β and IL-10 mRNA in cecal tonsils. In Experiment II, birds were orally gavaged with PBS or 1000μg CNP or a live commercial vaccine at 1 and 7d-of-age. At 14d-of-age, birds were orally challenged with 1 X 105 CFU/bird of live SE or S. Heidelberg (SH). Birds vaccinated with CNP showed higher (P<0.05) serum anti-OMPs IgG amounts at 8h-post-challenge. At 4d-post-SH challenge, birds vaccinated with CNP had higher (P<0.05) bile anti-flagellin IgA amounts. CNP decreased (P<0.05) anti-OMPs IgG levels in serum at 2d-post-SE challenge and 4d-post-SH or SE challenge. Salmonella Enteritidis loads in cecal content at 2d-post-challenge was decreased (P<0.05) by 65.9% in birds vaccinated with CNP, when compared to the control. Chitosan-nanovaccine had no adverse effects on bird’s production performance. In conclusion, 1000μg CNP vaccine can induce a specific immune response against Salmonella and has the potential to mitigate SE cecal colonization in broiler birds.
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Affiliation(s)
| | - Bailey Lester
- Department of Poultry Sciences, University of Georgia, Athens, Georgia, United States of America
| | - Sankar Renu
- Food Animal Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio, United States of America
- Department Of Veterinary Preventive Medicine, College Of Veterinary Medicine, The Ohio State University, Columbus, Ohio, United States of America
| | - Yi Han
- Food Animal Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio, United States of America
| | - Revathi Shanmugasundaram
- Department of Poultry Sciences, University of Georgia, Athens, Georgia, United States of America
| | - Renukaradhya Gourapura
- Food Animal Research Program, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio, United States of America
| | - Ramesh Selvaraj
- Department of Poultry Sciences, University of Georgia, Athens, Georgia, United States of America
- * E-mail:
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Lactobacillus reuteri Enhances the Mucosal Barrier Function against Heat-killed Salmonella Typhimurium in the Intestine of Broiler Chicks. J Poult Sci 2020; 57:148-159. [PMID: 32461730 PMCID: PMC7248004 DOI: 10.2141/jpsa.0190044] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Salmonella Typhimurium (ST) infection in chickens inhibits their growth and can lead to food-borne diseases in humans. Probiotics are expected to enhance the function of host intestinal barrier against pathogen infection. The aim of our study was to determine the effect of viable Lactobacillus reuteri (LR) on the response of the mucosal barrier function to antigen stimulation in broiler chicks. Day-old male (n=8) and female (n=4) broiler chicks were orally administered either 1 × 108 LR or a water-only control, every day for 7 days. After 7 days, either 1 × 108 heat-killed ST (k-ST), or a buffer-only control, was administered via intra-cardiac injection. The ileum and cecum were collected 3 h post-injection, and paraffin sections were prepared for either mRNA extraction (males), or gut permeability tests (females). Villus and crypt lengths were determined via histological analysis. Real-time PCR was used to calculate expression levels of Toll-like receptors (TLRs), pro-inflammatory cytokines, anti-inflammatory cytokines, avian β-defensins, and tight-junction-associated molecules. Gut permeability was assessed using the inverted intestine method. We found that (1) expression of TLR2-1, TLR21, TGF-β2 and TGF-β3 were reduced following k-ST stimulation, but were unaffected by LR-treatment; (2) oral administration of LR led to increased Claudin1, Claudin5, ZO2, and JAM2 expression following k-ST stimulation; (3) cecal permeability was reduced by co-treatment with LR and k-ST, but not by treatment with LR or k-ST alone. These results suggest that LR, as used in this study, may enhance the intestinal mucosal physical barrier function, but not the expression of other immune-related factors in newly hatched chicks.
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Markazi AD, Luoma A, Shanmugasundaram R, Murugesan R, Mohnl M, Selvaraj R. Effect of Acidifier Product Supplementation in Laying Hens Challenged With Salmonella. J APPL POULTRY RES 2019. [DOI: 10.3382/japr/pfz053] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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Carson C, Li XZ, Agunos A, Loest D, Chapman B, Finley R, Mehrotra M, Sherk LM, Gaumond R, Irwin R. Ceftiofur-resistant Salmonella enterica serovar Heidelberg of poultry origin - a risk profile using the Codex framework. Epidemiol Infect 2019; 147:e296. [PMID: 31679543 PMCID: PMC6836576 DOI: 10.1017/s0950268819001778] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 07/26/2019] [Accepted: 09/23/2019] [Indexed: 12/16/2022] Open
Abstract
Codex published the 'Guidelines for Risk Analysis of Foodborne Antimicrobial Resistance' to standardise the approach for evaluating risk posed by foodborne antimicrobial-resistant bacteria. One of the first steps in the guidelines is to compile a risk profile, which provides the current state of knowledge regarding a food safety issue, describes risk management options and recommends next steps. In Canada, ceftiofur/ceftriaxone-resistant Salmonella enterica subsp. enterica serovar Heidelberg from poultry was identified as an antimicrobial resistance (AMR) food safety issue. The first objective of this article was to contextualise this food safety issue, using the risk profile format of the Codex Guidelines. A second objective was to evaluate the applicability of the Codex Guidelines. This risk profile indicated that ceftiofur/ceftriaxone-resistant S. Heidelberg (CSH) was commonly isolated from poultry and was associated with severe disease in humans. Ceftiofur use in poultry hatcheries temporally mirrored the prevalence of CSH from poultry meat at retail and from people with salmonellosis. The evidence was sufficient to indicate the need for risk management options, such as restricting the use of ceftiofur in poultry. The Codex Guidelines provided a useful approach to summarise data for decision-makers to evaluate an AMR food safety issue.
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Affiliation(s)
- Carolee Carson
- Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, Ontario, Canada
| | - Xian-Zhi Li
- Veterinary Drugs Directorate, Health Products and Food Branch, Health Canada, Ottawa, Ontario, Canada
| | - Agnes Agunos
- Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, Ontario, Canada
| | - Daleen Loest
- Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, Ontario, Canada
| | - Brennan Chapman
- National Microbiology Laboratory, Public Health Agency of Canada, Guelph, Ontario, Canada
| | - Rita Finley
- Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, Ontario, Canada
| | - Manisha Mehrotra
- Veterinary Drugs Directorate, Health Products and Food Branch, Health Canada, Ottawa, Ontario, Canada
| | | | - Réjean Gaumond
- Market and Industry Services Branch, Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada
| | - Rebecca Irwin
- Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, Ontario, Canada
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Collineau L, Phillips C, Chapman B, Agunos A, Carson C, Fazil A, Reid-Smith RJ, Smith BA. A within-flock model of Salmonella Heidelberg transmission in broiler chickens. Prev Vet Med 2019; 174:104823. [PMID: 31734519 DOI: 10.1016/j.prevetmed.2019.104823] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 09/10/2019] [Accepted: 11/01/2019] [Indexed: 12/18/2022]
Abstract
As part of the development of a quantitative microbial risk assessment (QMRA) model of third-generation cephalosporins (3GC)-resistant Salmonella Heidelberg, a compartmental (SEIR) model for S. Heidelberg transmission within a typical Canadian commercial broiler chicken flock was developed. The model was constructed to estimate the within-flock prevalence and the bacterial concentration in the barn environment at pre-harvest, and to assess the effect of selected control measures. The baseline scenario predicted an average within-flock prevalence of 23.5 % (95 % tolerance interval: 15.7-31.4) and an average bacterial concentration of 3.579 (0-4.294) log CFU/g of feces in the barn environment at pre-harvest (on the day the flock is sent to slaughter). Because vertical introduction of S. Heidelberg into the barn was already uncommon in the baseline scenario, vaccination of broiler parent flocks appeared to have a negligible effect, while vaccination of broiler chicken flocks substantially reduced the bacterial concentration at pre-harvest. Cleaning and disinfection between batches markedly reduced the within-flock prevalence at pre-harvest, but the effect on bacterial concentration was limited outside of the beginning of the production period. Extending downtime between batches by 7 days had little effect on within-flock prevalence or bacterial concentration of S. Heidelberg when compared to the baseline scenario. This study provides a basis to describe S. Heidelberg dynamics within a broiler chicken flock and to predict the within-flock prevalence and bacterial concentration at pre-harvest, and includes a description of the limitations and data gaps. The results of these analyses and associated uncertainties are critical information for populating QMRA models of the downstream impacts on public health from on-farm and other food-chain practices. Specifically, the study findings will be integrated into a broader farm-to-fork QMRA model to support the risk-based control of S. Heidelberg resistant to 3GC in broiler chicken in Canada.
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Affiliation(s)
- Lucie Collineau
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Guelph, ON, Canada
| | - Charly Phillips
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Guelph, ON, Canada; Department of Biomedical Engineering, University of Waterloo, Waterloo, ON, Canada
| | - Brennan Chapman
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Guelph, ON, Canada; Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada
| | - Agnes Agunos
- Centre for Food-Borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON, Canada
| | - Carolee Carson
- Centre for Food-Borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON, Canada
| | - Aamir Fazil
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Guelph, ON, Canada
| | - Richard J Reid-Smith
- Department of Population Medicine, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada; Centre for Food-Borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Guelph, ON, Canada
| | - Ben A Smith
- Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Guelph, ON, Canada.
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Markazi A, Luoma A, Shanmugasundaram R, Mohnl M, Raj Murugesan G, Selvaraj R. Effects of drinking water synbiotic supplementation in laying hens challenged with Salmonella. Poult Sci 2018; 97:3510-3518. [PMID: 29982803 DOI: 10.3382/ps/pey234] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 06/16/2018] [Indexed: 02/03/2023] Open
Abstract
This experiment was conducted to study the effects of drinking water supplementation of synbiotic product PoultryStar®sol (containing Lactobacillus reuteri, Bifidobacterium animalis, Pediococcus acidilactici, Enterococcus faecium, and fructo-oligosaccharide) in laying hens with and without a Salmonella challenge. A total of 384 one-day-old layer chicks were randomly distributed to the drinking water synbiotic supplementation or control groups. At 14 wk of age, the birds were vaccinated with a Salmonella vaccine, resulting in a 2 (control and synbiotic) X 2 (non-vaccinated and vaccinated) factorial arrangement. At 24 wk of age, half of the birds in the vaccinated groups and all the birds that were not vaccinated were challenged with Salmonella Enterica serotype Enteritidis, resulting in a 3 (vaccinated, challenged, vaccinated+challenged) X 2 (control and synbiotic) factorial arrangment. At 8 d post-Salmonella challenge, synbiotic supplementation decreased (P = 0.04) cecal S. Enteritidis in the challenge group compared to the un-supplemented challenge group. Birds that were supplemented with synbiotic in the vaccine + challenge group had significantly greater cecal B. animalis and P. acidilactici percentage at 10 d post-Salmonella challenge than the birds in the vaccine + challenge group without synbiotic supplementation. At 3 d post-Salmonella challenge, birds that were supplemented with synbiotic in the challenge group had significantly greater cecal L. reuteri percentage than the birds in the challenge group without synbiotic supplementation. At 17 d post-Salmonella challenge, synbiotic supplementation increased bile anti-Salmonella IgA in the challenge group compared to the birds in the challenge group without synbiotic supplementation by 76.0%. At 10 d (P < 0.01) and 30 d (P = 0.05) post-Salmonella challenge, synbiotic supplementation decreased LITAF mRNA expression compared to the un-supplemented groups. At 3 d post-Salmonella challenge, synbiotic supplementation in the vaccine group had longer jejunal villi compared to the vaccine group without synbiotic supplementation. This experiment demonstrated that drinking water supplementation of the synbiotic product evaluated can significantly manipulate immune response and intestinal microbiota of laying hens post-Salmonella challenge to handle the challenge effectively.
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Affiliation(s)
- Ashley Markazi
- Department of Animal Sciences, Ohio Agricultural Research and Development Center, Wooster, OH 44691
| | - Amanda Luoma
- Department of Animal Sciences, Ohio Agricultural Research and Development Center, Wooster, OH 44691
| | - Revathi Shanmugasundaram
- Department of Animal Sciences, Ohio Agricultural Research and Development Center, Wooster, OH 44691
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Nair DVT, Kollanoor Johny A. Characterizing the Antimicrobial Function of a Dairy-Originated Probiotic, Propionibacterium freudenreichii, Against Multidrug-Resistant Salmonella enterica Serovar Heidelberg in Turkey Poults. Front Microbiol 2018; 9:1475. [PMID: 30050507 PMCID: PMC6052351 DOI: 10.3389/fmicb.2018.01475] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 06/13/2018] [Indexed: 01/29/2023] Open
Abstract
Antimicrobial potential of a dairy-origin probiotic bacteria, Propionibacterium freudenreichii, against multidrug-resistant Salmonella Heidelberg (SH) in turkey poults was determined in the current study. Employing in vitro experiments, two strains (subsp.) of P. freudenreichii: P. freudenreichii freudenreichii B3523 (PF) and P. freudenreichii shermanii B4327 (PS) were tested for their ability to resist low pH (2.5) and bile salts (0.3%). In addition, the ability of the strains to adhere to and invade avian epithelial cells was determined after exposure to Propionibacterium strains followed by SH challenge. Moreover, the antibacterial activity of the strains' cell-free culture supernatants (CFCSs) were tested against three major foodborne pathogens, including SH. Furthermore, the susceptibility of the strains to common antibiotics used for human therapy was determined. The hemolytic properties of the strains were determined in comparison to Streptococcus pyogenes, a known hemolysis-causing pathogen. Appropriate controls were kept in all studies. Using two in vivo experiments, PF was tested against SH colonization of poult ceca and dissemination to liver and spleen. The four treatment groups were: negative control, PF control (PFC), SH control (SC), and a test group (PFS; PF + SH). The poults in the PFC and PFS groups were inoculated with 1010 CFU ml-1 PF on day 1 through crop gavage and subsequently supplemented through drinking water. On day 7, SC and PFS groups were challenged with SH at 106 CFU ml-1, and after 7 days, cecum, liver, and spleen were collected for determining surviving SH populations. Results indicated that both PF and PS resisted pH = 2.5 and 0.3% bile salts with surviving populations comparable to the control and adhered well onto the avian epithelial cell lines. The strains were susceptible to antibiotics and did not invade the epithelial cells or exhibit hemolytic properties. The CFCSs were highly bactericidal against all tested pathogens. In turkey poults, PF significantly reduced cecal colonization of SH and the dissemination of the pathogen to the liver, compared to the SH challenge controls (P < 0.05). Results revealed that PF, a non-host gastrointestinal tract-derived probiotic, could be an antibiotic alternative to prevent the early colonization of SH in poults, improving the preharvest safety of turkeys.
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Affiliation(s)
| | - Anup Kollanoor Johny
- Department of Animal Science, University of Minnesota, Saint Paul, MN, United States
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Nair DVT, Vazhakkattu Thomas J, Noll S, Porter R, Kollanoor Johny A. Effect of Various Inoculum Levels of Multidrug-Resistant Salmonella enterica Serovar Heidelberg (2011 Ground Turkey Outbreak Isolate) on Cecal Colonization, Dissemination to Internal Organs, and Deposition in Skeletal Muscles of Commercial Turkeys after Experimental Oral Challenge. Front Microbiol 2018; 8:2680. [PMID: 29379476 PMCID: PMC5771268 DOI: 10.3389/fmicb.2017.02680] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 12/22/2017] [Indexed: 11/17/2022] Open
Abstract
Salmonella enterica serovar Heidelberg (S. Heidelberg) is a major foodborne pathogen colonizing poultry. The pathogen is associated with a significant number of foodborne outbreaks through contaminated poultry meat, including turkeys. Recently, multidrug-resistant (MDR) strains of S. Heidelberg have emerged as a threat to human public health in the United States. The objective of this study was to determine the cecal colonization, dissemination to internal organs, and the potential for skeletal muscle deposition of an MDR S. Heidelberg isolate from the 2011 ground turkey outbreak in the United States after the experimental oral challenge of poults (young turkeys) and adult turkey hens. In the poult study, two separate experiments using day-old, straight-run, commercial hybrid converter poults were randomly assigned to five challenge groups (0, 10∧2, 10∧4, 10∧6, 10∧8 CFU groups; 12 poults/group; N = 60/experiment) and a week after, treatment groups were challenged separately with 0-, 2-, 4-, 6-, and 8- log10 CFU of S. Heidelberg orally. After 14 days post-challenge, the poults were euthanized, and samples were collected to determine MDR S. Heidelberg colonization in the cecum, dissemination to liver and spleen, and deposition in the thigh, drumstick, and breast muscles. A similar experimental design was followed for the adult turkey hens. In two separate experiments, 11-week-old commercial Hybrid Converter turkey hens (4 hens/group; N = 20/experiment) were challenged with MDR S. Heidelberg and on day 16 post-challenge, birds were euthanized and samples were collected to determine Salmonella populations in the samples. The results indicated that, in turkey poults, the recovery of MDR S. Heidelberg was highest in the cecum followed by spleen, liver, thigh, drumstick, and breast. All tested inoculum levels resulted in more than 3.5 log10 CFU/g colonization in the poult cecum. The cecal colonization, dissemination to internal organs, and tissue deposition of MDR S. Heidelberg were high in poults. The pathogen recovery from the cecum of adult turkey hens ranged from 37.5 to 62.5% in the challenge groups. The results signify the importance of controlling MDR S. Heidelberg in turkeys at the farm level to improve the safety of turkey products.
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Affiliation(s)
- Divek V. T. Nair
- Department of Animal Science, University of Minnesota, Saint Paul, MN, United States
| | | | - Sally Noll
- Department of Animal Science, University of Minnesota, Saint Paul, MN, United States
| | - Robert Porter
- Department of Veterinary Population Medicine, University of Minnesota, Saint Paul, MN, United States
| | - Anup Kollanoor Johny
- Department of Animal Science, University of Minnesota, Saint Paul, MN, United States
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17
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Muniz EC, Verdi R, Leão JA, Back A, Nascimento VPD. Evaluation of the effectiveness and safety of a genetically modified live vaccine in broilers challenged with Salmonella Heidelberg. Avian Pathol 2017; 46:676-682. [PMID: 28660788 DOI: 10.1080/03079457.2017.1348598] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Salmonellosis ranks among the major diseases of commercial poultry, and its presence in poultry flocks is responsible for economic losses and risks related to public health. Vaccines are an important tool within integrated programmes to control salmonellosis. The purpose of this study was to assess cross-protection provided by the Poulvac® ST vaccine in the control of Salmonella Heidelberg in experimentally challenged 3- and 21-day-old birds. Eighty birds were identified and separated into four treatments (T1: vaccinated and challenged at 3 days of age, T2: unvaccinated and challenged at 3 days of age, T3: vaccinated and challenged at 21 days of age, and T4: unvaccinated and challenged at 21 days of age). The inoculum was produced from a Brazilian field strain of SH. At the end of the experiment, caecum and liver/spleen samples were collected for quantitative and qualitative analysis of SH, respectively. Analysis of the liver/spleen showed that Poulvac® ST significantly (P ≤ 0.05) reduced the percentage of SH positivity in the group challenged at 3 days of age, while in the group challenged at 21 days this difference was almost considered significant (P = 0.1818). On the other hand, there was no statistically significant difference in SH count in the caecum (CFU/g) in the group challenged at 3 days, but for the group challenged at 21 days the SH counts were significantly (P ≤ 0.05) lower in the vaccinated group when compared to the positive control.
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Affiliation(s)
| | - Renato Verdi
- a Zoetis Indústria de Produtos Veterinários Ltda , São Paulo , SP , Brazil
| | | | - Alberto Back
- b Mercolab Laboratórios Ltda , Cascavel , PR , Brazil
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18
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Previato do Amaral PFG, Otutumi LK, Rodrigues GV, Lima ET, Fernandes JIM, Vendrame A, Mezalira TS, Suenaga SS, Sestari DAO, Cestari IED, Martins LA. ASSESSMENT OF BENZOPHENANTHRIDINE AND PROTOPINE ALKALOIDS IN BROILER CHALLENGED AND NOT BY SALMONELLA HEIDELBERG. BRAZILIAN JOURNAL OF POULTRY SCIENCE 2016. [DOI: 10.1590/1806-9061-2015-0045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | | | | | - ET Lima
- Federal University of Paraná, Brazil
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19
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Borsoi A, Quinteiro-Filho WM, Calefi AS, Piantino Ferreira AJ, Astolfi-Ferreira CS, Florio JC, Palermo-Neto J. Effects of cold stress andSalmonellaHeidelberg infection on bacterial load and immunity of chickens. Avian Pathol 2015; 44:490-7. [DOI: 10.1080/03079457.2015.1086976] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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20
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Santos EG, Costa FGP, Silva JHV, Martins TDD, Figueiredo-Lima DF, Macari M, Oliveira CJB, Givisiez PEN. Protective effect of mannan oligosaccharides against early colonization by Salmonella Enteritidis in chicks is improved by higher dietary threonine levels. J Appl Microbiol 2013; 114:1158-65. [PMID: 23279100 DOI: 10.1111/jam.12108] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Revised: 10/08/2012] [Accepted: 12/17/2012] [Indexed: 11/29/2022]
Abstract
AIMS To evaluate mannan oligosaccharide (MOS) and threonine effects on performance, small intestine morphology and Salmonella spp. counts in Salmonella Enteritidis-challenged birds. METHODS AND RESULTS One-day-old chicks (1d) were distributed into five treatments: nonchallenged animals fed basal diet (RB-0), animals fed basal diet and infected with Salmonella Enteritidis (RB-I), animals fed high level of threonine and infected (HT-I), birds fed basal diet with MOS and infected (MOS-I), birds fed high level of threonine and MOS and infected (HT+MOS-I). Birds were inoculated at 2d with Salmonella Enteritidis, except RB-0 birds. Chicks fed higher dietary threonine and MOS showed performance similar to RB-0 and intestinal morphology recovery at 8 dpi. Salmonella counts and the number of Salmonella-positive animals were lower in HT+MOS-I compared with other challenged groups. CONCLUSION Mannan oligosaccharides and threonine act synergistically, resulting in improved intestinal environment and recovery after Salmonella inoculation. SIGNIFICANCE AND IMPACT OF THE STUDY Nutritional approaches may be useful to prevent Salmonella infection in the first week and putative carcass contamination at slaughter. This is the first report on the possible synergistic effect of mannan oligosaccharides and threonine, and further studies should be performed including performance, microbiota evaluation, composition of intestinal mucins and immune assessment.
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Affiliation(s)
- E G Santos
- Programa de Pós-Graduação em Zootecnia, Centro de Ciências Agrárias, Universidade Federal da Paraíba (UFPB), Areia, PB, Brazil
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21
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Amerah AM, Mathis G, Hofacre CL. Effect of xylanase and a blend of essential oils on performance and Salmonella colonization of broiler chickens challenged with Salmonella Heidelberg. Poult Sci 2012; 91:943-7. [PMID: 22399734 DOI: 10.3382/ps.2011-01922] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The present experiment examined the influence of xylanase supplementation and a blend of essential oils (EO; cinnamaldehyde and thymol) on performance and Salmonella horizontal transmission in broiler chickens challenged with Salmonella. Two thousand 1-d-old broiler chicks were randomly assigned to 5 dietary treatments (8 pens/treatment of 50 male broilers each). Four dietary treatments were challenged with Salmonella: 1) control, 2) basal diets supplemented with EO, 3) basal diet supplemented with xylanase (2,000 U/kg of feed), and 4) basal diet supplemented with a combination of EO and xylanase (2,000 U/kg of feed). One treatment served as an unchallenged control and was not supplemented with either additive. Broiler starter and finisher diets, based on wheat and soybean meal, were formulated, pelleted, and fed ad libitum. At d 1, before placement, half of the birds from each pen were tagged and dosed with Salmonella enterica serovar Heidelberg (5 × 10(5) cfu/mL). On d 42, 5 random untagged birds from each pen were killed and their ceca removed and tested for Salmonella. Performance data were analyzed as a completely randomized design using GLM. The frequency of positive Salmonella in the untagged birds was compared between treatments by using a chi-squared test of homogeneity. Challenging the birds with Salmonella had no effect (P > 0.05) on any of the measured performance parameters. Xylanase and EO supplementation improved (P < 0.05) the 42-d BW gain and feed efficiency, with no effect (P > 0.05) on feed intake, compared with that of the control treatment. Xylanase supplementation improved (P < 0.05) BW gain and feed efficiency compared with the results of EO supplementation. The combination treatment of xylanase and EO numerically improved BW gain and feed efficiency compared with the xylanase treatment. Xylanase and EO supplementation reduced (P < 0.05) the incidence of horizontal transmission of Salmonella infection between birds by 61 and 77%, respectively, compared with the control. The results of the current study suggested that dietary addition of EO and xylanase could improve broiler performance and contribute to food safety by lowering the incidence of horizontal transmission of Salmonella infection.
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Affiliation(s)
- A M Amerah
- Danisco Animal Nutrition, Marlborough, SN8 1XN UK.
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22
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Boumart Z, Roche SM, Lalande F, Virlogeux-Payant I, Hennequet-Antier C, Menanteau P, Gabriel I, Weill FX, Velge P, Chemaly M. Heterogeneity of persistence of Salmonella enterica serotype Senftenberg strains could explain the emergence of this serotype in poultry flocks. PLoS One 2012; 7:e35782. [PMID: 22545136 PMCID: PMC3335784 DOI: 10.1371/journal.pone.0035782] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Accepted: 03/21/2012] [Indexed: 11/18/2022] Open
Abstract
Salmonella enterica serotype Senftenberg (S. Senftenberg) has recently become more frequent in poultry flocks. Moreover some strains have been implicated in severe clinical cases. To explain the causes of this emergence in farm animals, 134 S. Senftenberg isolates from hatcheries, poultry farms and human clinical cases were analyzed. Persistent and non-persistent strains were identified in chicks. The non-persistent strains disappeared from ceca a few weeks post inoculation. This lack of persistence could be related to the disappearance of this serotype from poultry farms in the past. In contrast, persistent S. Senftenberg strains induced an intestinal asymptomatic carrier state in chicks similar to S. Enteritidis, but a weaker systemic infection than S. Enteritidis in chicks and mice. An in vitro analysis showed that the low infectivity of S. Senftenberg is in part related to its low capacity to invade enterocytes and thus to translocate the intestinal barrier. The higher capacity of persistent than non-persistent strains to colonize and persist in the ceca of chickens could explain the increased persistence of S. Senftenberg in poultry flocks. This trait might thus present a human health risk as these bacteria could be present in animals before slaughter and during food processing.
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Affiliation(s)
- Zineb Boumart
- INRA, UR1282 Infectiologie Animale et Santé Publique, Nouzilly France
- ANSES, Laboratoire de Ploufragan-Plouzané, Unité Hygiène et Qualité des Produits Avicoles et Porcins, Ploufragan, France
| | - Sylvie M. Roche
- INRA, UR1282 Infectiologie Animale et Santé Publique, Nouzilly France
- IFR136 Agents transmissibles et Infectiologie, Université François Rabelais de Tours, Tours, France
| | - Françoise Lalande
- ANSES, Laboratoire de Ploufragan-Plouzané, Unité Hygiène et Qualité des Produits Avicoles et Porcins, Ploufragan, France
| | - Isabelle Virlogeux-Payant
- INRA, UR1282 Infectiologie Animale et Santé Publique, Nouzilly France
- IFR136 Agents transmissibles et Infectiologie, Université François Rabelais de Tours, Tours, France
| | | | - Pierrette Menanteau
- INRA, UR1282 Infectiologie Animale et Santé Publique, Nouzilly France
- IFR136 Agents transmissibles et Infectiologie, Université François Rabelais de Tours, Tours, France
| | | | - François-Xavier Weill
- Institut Pasteur, Unité des Bactéries Pathogènes Entériques, Centre National de Référence des Salmonella, Paris, France
| | - Philippe Velge
- INRA, UR1282 Infectiologie Animale et Santé Publique, Nouzilly France
- IFR136 Agents transmissibles et Infectiologie, Université François Rabelais de Tours, Tours, France
- * E-mail:
| | - Marianne Chemaly
- ANSES, Laboratoire de Ploufragan-Plouzané, Unité Hygiène et Qualité des Produits Avicoles et Porcins, Ploufragan, France
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