Weaned piglets: another factor to be considered for the control of Salmonella infection in breeding pig farms

AbstractField studies onSalmonella 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 5Salmonella-seropositive breeding farms to collect gastrointestinal packages and perform a thorough detection ofSalmonella 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 inSalmonella 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 circula...
Source: Veterinary Research - Category: Veterinary Research Source Type: research

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Publication date: Available online 6 September 2019Source: Small Ruminant ResearchAuthor(s): I. Rubira, L. Figueras, M. De las Heras, J.P. Bueso, E. Castells, M. Climent, D. LacastaAbstractChronic proliferative rhinitis (CPR) is a slow and progressive upper respiratory tract disease of sheep with a poor prognosis for affected animals. It causes a proliferative inflammation of the ventral nasal turbinates with uni or bilateral affection that may totally obstruct the nasal cavity. Salmonella enterica subspecies diarizonae serovar 61:k:1,5,(7) has been associated with the disease. This microorganism, host-adapted of tonsils a...
Source: Small Ruminant Research - Category: Zoology Source Type: research
This study provides valuable insight about the epidemiology of Salmonella in swine production, and despite the low presence of this pathogen in carcasses and meat cuts, the majority of isolates was multidrug resistant. PMID: 31476581 [PubMed - as supplied by publisher]
Source: International Journal of Food Microbiology - Category: Food Science Authors: Tags: Int J Food Microbiol Source Type: research
In conclusion, the mouse pharyngeal colonization model is an affordable and accessible experimental system that allows a broader group of research groups to test the importance of their findings in an in vivo model. There is a great deal of overlap between the bacterial and immune factors found to be important in human and murine pharyngeal colonization. Although MHC-II humanized mice could prove useful in answering certain questions, the use of inbred mouse lines appears to be sufficient for evaluation of most questions, both related to bacterial factors and the host immune response. However, when promising treatments or ...
Source: Frontiers in cellular and infection microbiology - Category: Microbiology Source Type: research
Conclusions As the intestinal mucosa surface constitutes the major surface of the body which is in direct contact with the outer environment, intestinal immune homeostasis must be accurately regulated. The interplay between commensal microbiota, intestinal stromal cells, and the mucosal immune system components should guarantee the intestinal homeostasis to avoid a sustained inflammation that could induce tissue damage. However, several factors can lead to inflammation through homeostasis breakdown. Figure 1 summarizes the main points that have been reviewed here. We have described what it is known so far about the role o...
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
Publication date: Available online 6 March 2019Source: Veterinary MicrobiologyAuthor(s): María Cevallos-Almeida, Laure Martin, Catherine Houdayer, Valerie Rose, Jean-Marie Guionnet, Frédéric Paboeuf, Martine Denis, Annaëlle KerouantonAbstractSalmonella serovars Derby, Typhimurium and the monophasic variant of Salmonella Typhimurium are the most frequently isolated serovars in pigs in France. To compare the excretion patterns, seroconversion to Salmonella and contamination of the organs of pigs inoculated with strains of all three serovars, we conducted an experimental trial with 28 SPF piglets. Fo...
Source: Veterinary Microbiology - Category: Veterinary Research Source Type: research
The objectives of the present study were to evaluate the antimicrobial effect of boric acid (BA) on Salmonella enteritidis colonization, intestinal permeability, total intestinal IgA levels, and cecal microbiota composition in broiler chickens. For this purpose, sixty day-old-chicks were randomly allocated to one of two groups: 1) non-treated control group and 2) 0.1% (w/w) BA in feed. All chicks were challenged with 104 cfu of S. Enteritidis per bird at 1-d old. On day 3 and 10 post-challenge, samples of crop and ceca-cecal tonsils (CCT) were aseptically collected to evaluate overall aerobic and lactic acid bacteria, as...
Source: Research in Veterinary Science - Category: Veterinary Research Source Type: research
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 th...
Source: Canadian Journal of Veterinary Research - Category: Veterinary Research Authors: Tags: Can J Vet Res Source Type: research
This study compared the current pig slaughter procedure where the pluck set is completely removed with a procedure where the pluck set is partially removed, leaving the highly contaminated oral cavity, tonsils and tongue untouched. The effect on carcass contamination was investigated by enumerating hygiene indicator bacteria (total aerobic count, Enterobacteriaceae and E. coli) and cefotaxime-resistant E. coli (CREC) as well as assessing Salmonella and Yersinia enterocolitica presence on the sternum, elbow and throat of pig carcasses. Using the alternative pluck set removal, significantly lower mean numbers of hygiene indi...
Source: Meat Science - Category: Food Science Source Type: research
In conclusion, the presented screening protocol offers a rapid and efficient way to obtain prevalence data from a large sample set as well as MLVA-data within a short time frame. These results can hence improve the knowledge on the epidemiology and distribution of these pathogens and their importance to public health.
Source: Journal of Microbiological Methods - Category: Microbiology Source Type: research
This study compared the current pig slaughter procedure where the pluck set is completely removed with a procedure where the pluck set is partially removed, leaving the highly contaminated oral cavity, tonsils and tongue untouched. The effect on carcass contamination was investigated by enumerating hygiene indicator bacteria (total aerobic count, Enterobacteriaceae and E. coli) and cefotaxime-resistant E. coli (CREC) as well as assessing Salmonella and Yersinia enterocolitica presence on the sternum, elbow and throat of pig carcasses. Using the alternative pluck set removal, significantly lower mean numbers of hygiene indi...
Source: Meat Science - Category: Food Science Source Type: research
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