Longitudinal study of Salmonella species in 90 Alberta swine finishing farms

Variation of bacteriologic and serologic Salmonella enterica prevalence between cohorts within finishing swine production farms

“…The observed prevalence variation prevented the categorization (or separation) of the production farms as high or low Salmonella prevalence farms. Our results complement reported longitudinal studies that observed variation of Salmonella prevalence overtime in the same groups of pigs repeatedly sampled (Beloeil et al, 2003;Funk et al, 2001;Kranker et al, 2003;Lo Fo Wong et al, 2004;Rajic et al, 2005;van der Wolf et al, 2001). Additionally, our results are supported by Farzan et al (2008) and Rajic et al (2007) that reported significant variability in the proportion of Salmonella-positive farms, based on repeated samplings.…”

“…However, although a number of longitudinal investigations of Salmonella epidemiology in swine herds have been conducted (Beloeil et al, 2003;Funk, Davies, & Nichols, 2001;Kranker, Alban, Boes, & Dahl, 2003;Lo Fo Wong et al, 2004;Rajic et al, 2005;van der Wolf et al, 2001), the Salmonella transmission dynamics in swine populations is mostly unknown, limiting our knowledge of the epidemiology of this important foodborne pathogen. Therefore, this study was conducted with the objective of evaluating the consistency of Salmonella prevalence (bacteriologic and serologic) in cohorts of finishing pig lots produced by multiple production farms, and to compare prevalence estimates based on the isolation of Salmonella from fecal samples and the detection of "meat juice" antibodies.…”

The occurrence and sources of Campylobacter spp., Salmonellaenterica and Escherichia coli O157:H7 in the Salmon River, British Columbia, Canada

“…serovars Mbandaka and Typhimurium Copenhagen (Table 6), which are commonly isolated from pigs (Davies et al 1999;Gebreyes et al 2004a,b;Rajic et al 2005), were more prevalent in areas with greater pig population densities (Table 1). The Bacteroides ruminant-specific marker (Table 2), C. jejuni isolates with flaA-RFLP profiles that matched those of ruminant animals (Table 5), and E. coli O157:H7 (Table 2), which are commonly associated with ruminant faeces (Walters et al 2007;La Ragione et al 2009),…”

Associations between the proportion of Salmonella seropositive slaughter pigs and the presence of herd level risk factors for introduction and transmission of Salmonella in 34 Danish organic, outdoor (non-organic) and indoor finishing-pig farms

“…Utensils contaminated with faeces can serve as a reservoir for Salmonella (Letellier et al, 1999;Gray and Fedorka-Cray, 2001;Feder et al, 2001;Small et al, 2003;Rajic et al, 2005;Bahnson et al, 2005). Berends et al (1996) concluded that farm hygiene was an important risk factor for Salmonella.…”