Salmonella infections in finishing pigs in The Netherlands: bacteriological herd prevalence, serogroup and antibiotic resistance of isolates and risk factors for infection

Wolf, P.J. van der; Bongers, J.H.; Elbers, A.R.W.; Franssen, F.; Hunneman, W. A.; Exsel, A. C. A. van; Tielen, M.J.M.

doi:10.1016/s0378-1135(99)00054-1

Cited by 112 publications

(64 citation statements)

References 14 publications

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“…Previously published studies concerning Salmonella enterica contamination of pig herds assessed by environmental samples are relatively rare. The pig herd Salmonella contamination rates reported in three different studies were 23.7% [39], 21% [35], 10.1% [36]. Since the type of sample used in these studies was pooled faecal samples, it is therefore difficult to compare these data with the results of our study, obtained using a specific device.…”

Section: Discussionmentioning

confidence: 70%

“…Since the type of sample used in these studies was pooled faecal samples, it is therefore difficult to compare these data with the results of our study, obtained using a specific device. According to Van der Wolf et al [39], the prevalence observed in their study underestimated the "true" prevalence of Salmonella in pigs in The Netherlands. The differences in herd sampling and in the sensitivity of the environmental sampling methods used could explain the different rates observed in the present study and reported in the literature.…”

Section: Discussionmentioning

confidence: 82%

“…Pigs may become infected during the rearing period on the farm. Asymptomatic intestinal carriage and intermittent shedding of small numbers of Salmonella characterise subclinically Salmonella-infected pigs [39,42]. However, from the moment they leave the farm, pigs are exposed on several occasions to a risk of Salmonella contamination.…”

Section: Introductionmentioning

confidence: 99%

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Impact of the Salmonella status of market-age pigs and the pre-slaughter process on Salmonella caecal contamination at slaughter

et al. 2004

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-The aim of this study was to evaluate the impact of the pre-slaughter process on Salmonella caecal contamination of pigs at slaughter. An observational study was carried out in 2001 on 101 conventional farrow-to-finish pig farms. On each farm, one batch of contemporary pigs was followed from the end of the fattening period until slaughter. The Salmonella bacteriological status of the batches was assessed by environmental samples of faecal material. The serological Salmonella status was obtained on 30 individually identified market-age pigs using an indirect ELISA test. At the slaughterhouse, 25 g of caecal contents were taken from 10 of the identified pigs. Faecal and caecal material were analysed according to a classical bacteriological method. A questionnaire was designed to obtain information about the type of feeding during the fattening period (dry versus wet), the duration of fasting on the farm before leaving for the slaughterhouse, the duration of transport between the farm and the slaughterhouse, the holding time in lairage at the slaughterhouse and loading and unloading conditions on the farm and at the slaughterhouse. To assess the relationships between these factors and the Salmonella caecal status of the pigs and the batches, two logistic models were fitted at the individual and at the batch level, respectively. The first analysis was performed using a random effects logistic regression model. The second analysis was based on a cumulative logit model with a positive caecal rate classified into three classes as the outcome variable. The results showed that the Salmonella status of market-age pigs assessed on the farm either by serological or bacteriological examinations and the time spent in lairage before slaughtering played a crucial role on caecal contamination. In the light of these results, actions should be considered both on the farm and at the slaughterhouse to decrease the risk of Salmonella contamination of the caecal contents.

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Section: Discussionmentioning

confidence: 70%

Section: Discussionmentioning

confidence: 82%

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Impact of the Salmonella status of market-age pigs and the pre-slaughter process on Salmonella caecal contamination at slaughter

et al. 2004

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“…Besides eggs and poultry meat, pork is one of the most important sources of human infection [21,36]. In order to prevent human disease due to the consumption of Salmonella contaminated pork, many studies have focussed on the epidemiology and the control of Salmonella in finishing pigs [5,18,23,34,35]. Also many studies have focussed on the lairage and the slaughterhouse in order to prevent contamination of pig carcasses as much as possible [4,7,8,31].…”

Section: Introductionmentioning

confidence: 99%

Salmonella in sows: a longitudinal study in farrow-to-finish pig herds

et al. 2005

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-Besides finishing pigs, sows are also believed to be important in the epidemiology of Salmonella. The study objective was to investigate the prevalence of Salmonella excretion in sows during an entire reproductive cycle. In 3 farrow-to-finish herds, groups of 34, 40 and 32 sows, respectively, were sampled serially. Faecal samples, environmental swabs and feed samples were taken and submitted to a qualitative Salmonella isolation. All isolates were characterised using RAPD and a representative number of isolates was serotyped. The prevalence of Salmonella excretion was < 10% during gestation, around farrowing and during lactation, but a significant increase in the number of Salmonella excreting sows was found in herds A (p < 0.01) and C (p = 0.02) after weaning. S. Infantis was the most prevalent serotype in herd A, S. Derby in herds B and C. Except for the S. Infantis group in herd A, all isolates within each group of the RAPD analysis belonged to the same serotype. Three sows in herd A and 1 sow in herd C shed different serotypes at different time points. The present results indicate that sows can maintain Salmonella infections in farrow-to-finish herds and that culled sows, leaving the herd after weaning, may constitute a substantial risk for contamination of their carcasses with Salmonella.

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“…To avoid outbreak of food-borne diseases due to meat and eggs, their practitioner and veterinarian should recognize and take care for prevention of infection of domestic animals with food-borne disease related organisms including Salmonella. Generally, to estimate the Salmonella prevalence in pig herds, bacteriological examinations were performed on fecal and clinical tissue samples of pigs [2,7,13,17]. Serological examinations by enzyme-linked immunosorbent assay (ELISA) of serum and meat juice were also undertaken in several countries [9,10,14,15].…”

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confidence: 99%

Isolation and Serological Survey of Salmonella in Pigs in Japan.

Asai

Fujii

Osumi

et al. 2002

The Journal of Veterinary Medical Science

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ABSTRACT. A total of 267 fecal and serum samples collected from individual pigs reared on a Salmonella-positive farm were subjected to bacteriological and serological examinations of Salmonella. Salmonella was isolated from 47 pigs (17.6%) and prevalence of antibody to lipopolysaccharide (LPS) of S. Typhimurium, which was partly common to S. O4, 12: d: -, was observed in 90 pigs (33.7%). Salmonella was isolated from 26 (28.9%) of 90 antibody-positive pigs and 21 (11.9%) of 177 antibody-negative pigs. Twenty-one of 36 pigs (58.3%) positive for S. O4, 12: d: -, five of 10 pigs (50.0%) positive for S. Havana, and none for S. Anatum had antibodies. Thus, seropositive rates were higher than isolation-positive rates, and antibody prevalence was associated with serovars of the isolates. Then, we analyzed antibody prevalence among pigs on Japanese pig farms. The antibodies to LPS of S. Typhimurium were found in 195 of 1,498 pigs (13.0%) and in at least one serum sample on 35 of 52 farms (67.3%). Our results indicate that Salmonella does not seem to be so prevalent in pigs though it is widely prevalent among pig farms.

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Salmonella infections in finishing pigs in The Netherlands: bacteriological herd prevalence, serogroup and antibiotic resistance of isolates and risk factors for infection

Cited by 112 publications

References 14 publications

Impact of the Salmonella status of market-age pigs and the pre-slaughter process on Salmonella caecal contamination at slaughter

Impact of the Salmonella status of market-age pigs and the pre-slaughter process on Salmonella caecal contamination at slaughter

Salmonella in sows: a longitudinal study in farrow-to-finish pig herds

Isolation and Serological Survey of Salmonella in Pigs in Japan.

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