Salmonella Enteritidis in shell eggs: Current issues and prospects for control

Howard, Zoe; O’Bryan, Corliss A.; Crandall, Philip G.; Ricke, Steven C.

doi:10.1016/j.foodres.2011.04.030

Cited by 147 publications

(114 citation statements)

References 137 publications

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“…Those studies demonstrated that when mice were orally challenged, low-invasive strains were as virulent as high-invasive strains, even though not all S. Enteritidis isolates recovered from poultry are equally pathogenic. Some of the infectivity differences between S. Enteritidis and other serovars in avian model systems may be related to the seemingly high epidemiological frequency and long-term association of S. Enteritidis with egg-related salmonellosis and a potentially unique evolutionary relationship with laying hens (248)(249)(250)(251)(252)(253)(254)(255)(256). This relationship may be evidenced by the limited genetic diversity observed among S. Enteritidis strains based on random amplified polymorphic DNA plasmid profiling and phage typing (257).…”

Section: The Salmonella-chicken Host Interactionmentioning

confidence: 99%

Salmonella Pathogenicity and Host Adaptation in Chicken-Associated Serovars

Foley

Johnson

Ricke

et al. 2013

Microbiol Mol Biol Rev

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247

218

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SUMMARY Enteric pathogens such as Salmonella enterica cause significant morbidity and mortality. S. enterica serovars are a diverse group of pathogens that have evolved to survive in a wide range of environments and across multiple hosts. S. enterica serovars such as S . Typhi, S . Dublin, and S . Gallinarum have a restricted host range, in which they are typically associated with one or a few host species, while S . Enteritidis and S . Typhimurium have broad host ranges. This review examines how S. enterica has evolved through adaptation to different host environments, especially as related to the chicken host, and continues to be an important human pathogen. Several factors impact host range, and these include the acquisition of genes via horizontal gene transfer with plasmids, transposons, and phages, which can potentially expand host range, and the loss of genes or their function, which would reduce the range of hosts that the organism can infect. S . Gallinarum, with a limited host range, has a large number of pseudogenes in its genome compared to broader-host-range serovars. S. enterica serovars such as S . Kentucky and S . Heidelberg also often have plasmids that may help them colonize poultry more efficiently. The ability to colonize different hosts also involves interactions with the host's immune system and commensal organisms that are present. Thus, the factors that impact the ability of Salmonella to colonize a particular host species, such as chickens, are complex and multifactorial, involving the host, the pathogen, and extrinsic pressures. It is the interplay of these factors which leads to the differences in host ranges that we observe today.

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Section: The Salmonella-chicken Host Interactionmentioning

confidence: 99%

Salmonella Pathogenicity and Host Adaptation in Chicken-Associated Serovars

Foley

Johnson

Ricke

et al. 2013

Microbiol Mol Biol Rev

Self Cite

247

218

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“…almonella enterica serovar Enteritidis, a Gram-negative intracellular pathogen, is frequently isolated from human infections (1). Salmonella infection exerts a considerable burden on both developing and developed countries; for example, the high prevalence of food-borne salmonellosis has been estimated to result in approximately 155,000 deaths worldwide every year (2).…”

mentioning

confidence: 99%

Salmonella enterica Serovar Enteritidis Ghosts Carrying the Escherichia coli Heat-Labile Enterotoxin B Subunit Are Capable of Inducing Enhanced Protective Immune Responses

Jawale

Lee

2014

Clin Vaccine Immunol

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The Escherichia coli heat-labile enterotoxin B subunit (LTB) is a potent vaccine adjuvant. Salmonella enterica serovar Enteritidis ghosts carrying LTB (S. Enteritidis-LTB ghosts) were genetically constructed using a novel plasmid, pJHL187-LTB, designed for the coexpression of the LTB and E lysis proteins. S. Enteritidis-LTB ghosts were characterized using scanning electron microscopy to visualize their transmembrane tunnel structures. The expression of LTB in S. Enteritidis-LTB ghost preparations was confirmed by immunoblot and enzyme-linked immunosorbent assays. The parenteral adjuvant activity of LTB was demonstrated by immunizing chickens with either S. Enteritidis-LTB ghosts or S. Enteritidis ghosts. Chickens were intramuscularly primed at 5 weeks of age and subsequently boosted at 8 weeks of age. In total, 60 chickens were equally divided into three groups

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“…Poultry and eggs are considered as most important reservoirs from which Salmonella is passed through the food chain and ultimately transmitted to humans 12 . The levels of this pathogen in poultry can vary depending on country, production system and the specific control measures in place 13 .…”

Section: Poultry As a Source Of Salmonellosismentioning

confidence: 99%