Full Text Journal Articles by
Author Richard K Gast

Advertisement

Find full text journal articles






Research Note: Horizontal transmission and internal organ colonization by Salmonella Enteritidis and Salmonella Kentucky in experimentally infected laying hens in indoor cage-free housing.

Richard K Gast, Deana R Jones, Rupa Guraya, Kenneth E Anderson, Darrin M Karcher,

The transmission of Salmonella to humans via contaminated eggs is an international public health concern. S. Enteritidis is deposited inside eggs after colonizing reproductive tissues of infected hens. Diverse housing facility characteristics and flock management practices influence Salmonella persistence and transmission in poultry, but the food safety consequences of different ... Read more >>

Poult Sci (Poultry science)
[2020, 99(11):6071-6074]

Cited: 0 times

View full text PDF listing >>



Pooling of Laying Hen Environmental Swabs and Efficacy of Salmonella Detection.

Deana R Jones, Richard K Gast, Prafulla Regmi, Garrett E Ward, Kenneth E Anderson, Darrin M Karcher,

ABSTRACT:Environmental testing for Salmonella Enteritidis is required for U.S. shell egg producers with ≥3,000 hens on a farm. The egg producer assumes all costs for the mandatory testing. According to the U.S. Food and Drug Administration (FDA) Egg Rule, either manure scraper or drag swabs can be collected according to ... Read more >>

J Food Prot (Journal of food protection)
[2020, 83(6):943-950]

Cited: 0 times

View full text PDF listing >>



Advertisement

Contamination of eggs by Salmonella Enteritidis in experimentally infected laying hens of four commercial genetic lines in conventional cages and enriched colony housing.

Richard K Gast, Prafulla Regmi, Rupa Guraya, Deana R Jones, Kenneth E Anderson, Darrin M Karcher,

Human illness caused by the consumption of eggs contaminated with Salmonella Enteritidis is a continuing international public health concern. This pathogen is deposited inside the edible contents of eggs as a consequence of its ability to colonize reproductive tissues in infected hens. Conditions in the housing environment can influence the ... Read more >>

Poult Sci (Poultry science)
[2019, 98(10):5023-5027]

Cited: 0 times

View full text PDF listing >>



Colonization of internal organs by Salmonella Enteritidis in experimentally infected laying hens of four commercial genetic lines in conventional cages and enriched colony housing.

Richard K Gast, Prafulla Regmi, Rupa Guraya, Deana R Jones, Kenneth E Anderson, Darrin M Karcher,

The prevalence of Salmonella Enteritidis in commercial egg-laying flocks is a prominent public health concern because contaminated eggs cause human illness. Deposition of this pathogen inside eggs results from bacterial colonization of reproductive tissues in infected hens. Environmental conditions can influence avian Salmonella infections, but the food safety consequences of ... Read more >>

Poult Sci (Poultry science)
[2019, 98(4):1785-1790]

Cited: 1 time

View full text PDF listing >>



Prevalence, Persistence, and Antimicrobial Resistance of Campylobacter spp. from Eggs and Laying Hens Housed in Five Commercial Housing Systems.

Estefanía Novoa Rama, Matthew Bailey, Deana R Jones, Richard K Gast, Ken Anderson, Jagpinder Brar, Rhonda Taylor, Haley F Oliver, Manpreet Singh,

Husbandry practices for laying hens in commercial egg production is a topic of interest from a social, economic, and regulatory standpoint. Animal welfare concerns regarding the use of conventional cages have arisen and consumer perceptions of hen welfare have led to a higher demand for cage-free eggs. The aim of ... Read more >>

Foodborne Pathog Dis (Foodborne pathogens and disease)
[2018, 15(8):506-516]

Cited: 0 times

View full text PDF listing >>



Multiplication in Egg Yolk and Survival in Egg Albumen of Genetically and Phenotypically Characterized Salmonella Enteritidis Strains.

Richard K Gast, Jean Guard, Rupa Guraya, Aude Locatelli,

Prompt refrigeration of eggs to prevent the multiplication of Salmonella Enteritidis to high levels during storage is an important practice for reducing the risk of egg-transmitted human illness. The efficacy of egg refrigeration for achieving this goal depends on the interaction among the location of contamination, the ability of contaminant ... Read more >>

J Food Prot (Journal of food protection)
[2018, 81(6):876-880]

Cited: 2 times

View full text PDF listing >>



Serotyping of Salmonella Enterica Isolated from Mice Caught on US Poultry Farms 1995 through 1998.

Jean Guard, David J Henzler, Hazem Ramadan, Deana R Jones, Richard K Gast, Sherrill Davison, Marc W Allard,

In this study, a collection of Salmonella enterica subspecies obtained from live mice caught on 32 poultry farms in the Northeast US between 1995 to 1998 was evaluated to provide a historical reference for serotype distribution during a time when egg contamination by serotype Enteritidis was at its peak. Of ... Read more >>

Food Saf (Tokyo) (Food safety (Tokyo, Japan))
[2018, 6(1):44-50]

Cited: 0 times

View full text PDF listing >>



Frequency and Duration of Fecal Shedding of Salmonella Serovars Heidelberg and Typhimurium by Experimentally Infected Laying Hens Housed in Enriched Colony Cages at Different Stocking Densities.

Richard K Gast, Rupa Guraya, Deana R Jones, Jean Guard, Kenneth E Anderson, Darrin M Karcher,

Eggs contaminated with Salmonella Enteritidis are leading sources of human salmonellosis, but Salmonella Heidelberg and Salmonella Typhimurium are also egg-associated pathogens. The management practices and housing facilities characterizing different systems for housing commercial egg flocks can influence Salmonella persistence and transmission. Animal welfare aspects of poultry housing have been widely ... Read more >>

Avian Dis (Avian diseases)
[2017, 61(3):366-371]

Cited: 2 times

View full text PDF listing >>



Frequency and Duration of Fecal Shedding of Salmonella Enteritidis by Experimentally Infected Laying Hens Housed in Enriched Colony Cages at Different Stocking Densities.

Richard K Gast, Rupa Guraya, Deana R Jones, Kenneth E Anderson, Darrin M Karcher,

Human infections with Salmonella Enteritidis are often attributed to the consumption of contaminated eggs, so the prevalence of this pathogen in egg-laying poultry is an important public health risk factor. Numerous and complex environmental influences on Salmonella persistence and transmission are exerted by management practices and housing facilities used in ... Read more >>

Front Vet Sci (Frontiers in veterinary science)
[2017, 4:47]

Cited: 5 times

View full text PDF listing >>



Colonization of internal organs by Salmonella serovars Heidelberg and Typhimurium in experimentally infected laying hens housed in enriched colony cages at different stocking densities.

Richard K Gast, Rupa Guraya, Deana R Jones, Jean Guard, Kenneth E Anderson, Darrin M Karcher,

Contaminated eggs produced by infected commercial laying flocks are often implicated as sources of human infections with Salmonella Enteritidis, but Salmonella serovars Heidelberg and Typhimurium have also been associated with egg-transmitted illness. Contamination of the edible contents of eggs is a consequence of the colonization of reproductive tissues in systemically ... Read more >>

Poult Sci (Poultry science)
[2017, 96(5):1402-1409]

Cited: 2 times

View full text PDF listing >>



Colonization of internal organs by Salmonella Enteritidis in experimentally infected laying hens housed in enriched colony cages at different stocking densities.

Richard K Gast, Rupa Guraya, Deana R Jones, Kenneth E Anderson, Darrin M Karcher,

Epidemiologic analyses have linked the frequency of human infections with Salmonella enterica subspecies enterica serovar Enteritidis to the consumption of contaminated eggs and thus to the prevalence of this pathogen in commercial egg-laying flocks. Contamination of the edible contents of eggs by Salmonella Enteritidis is a consequence of the colonization ... Read more >>

Poult Sci (Poultry science)
[2016, 95(6):1363-1369]

Cited: 7 times

View full text PDF listing >>



Metabolic parameters linked by phenotype microarray to acid resistance profiles of poultry-associated Salmonella enterica.

Jean Guard, Michael J Rothrock, Devendra H Shah, Deana R Jones, Richard K Gast, Roxana Sanchez-Ingunza, Melissa Madsen, John El-Attrache, Bwalya Lungu,

Phenotype microarrays were analyzed for 51 datasets derived from Salmonella enterica. The top 4 serotypes associated with poultry products and one associated with turkey, respectively Typhimurium, Enteritidis, Heidelberg, Infantis and Senftenberg, were represented. Datasets were partitioned initially into two clusters based on ranking by values at pH 4.5 (PM10 A03). ... Read more >>

Res. Microbiol. (Research in microbiology)
[2016, 167(9-10):745-756]

Cited: 3 times

View full text PDF listing >>



Persistence of fecal shedding of Salmonella Enteritidis by experimentally infected laying hens housed in conventional or enriched cages.

Richard K Gast, Rupa Guraya, Deana R Jones, Kenneth E Anderson,

Salmonella Enteritidis can be deposited inside eggs laid by infected hens, so the prevalence of this pathogen in commercial egg-producing flocks is an important risk factor for human illness. Opportunities for the introduction, transmission, and persistence of salmonellae in poultry are potentially influenced by flock housing and management systems. Animal ... Read more >>

Poult Sci (Poultry science)
[2015, 94(7):1650-1656]

Cited: 9 times

View full text PDF listing >>



Recovery of Salmonella enterica serovar Enteritidis from hens initially infected with serovar Kentucky.

Jean Guard, Roxana Sanchez-Ingunza, Devendra H Shah, Michael J Rothrock, Richard K Gast, Deana R Jones,

Salmonella enterica serovars Enteritidis and Kentucky differ greatly in epidemiology. We wanted to know if the non-pathogenic serotype Kentucky impacted the recovery of the pathogen Enteritidis from chickens. To explore this issue, 4 groups of hens were treated as follows: (i) hens were inoculated orally with Kentucky and injected intramuscularly ... Read more >>

Food Chem (Food chemistry)
[2015, 189:86-92]

Cited: 3 times

View full text PDF listing >>



Horizontal transmission of Salmonella Enteritidis in experimentally infected laying hens housed in conventional or enriched cages.

Richard K Gast, Rupa Guraya, Deana R Jones, Kenneth E Anderson,

The majority of human illnesses caused by Salmonella Enteritidis are attributed to contaminated eggs, and the prevalence of this pathogen in commercial laying flocks has been identified as a leading epidemiologic risk factor. Flock housing and management systems can affect opportunities for the introduction, transmission, and persistence of foodborne pathogens ... Read more >>

Poult Sci (Poultry science)
[2014, 93(12):3145-3151]

Cited: 8 times

View full text PDF listing >>



Contamination of eggs by Salmonella Enteritidis in experimentally infected laying hens housed in conventional or enriched cages.

Richard K Gast, Rupa Guraya, Deana R Jones, Kenneth E Anderson,

Both epidemiologic analyses and active disease surveillance confirm an ongoing strong association between human salmonellosis and the prevalence of Salmonella enterica subspecies enterica serovar Enteritidis in commercial egg flocks. The majority of human illnesses caused by this pathogen are attributed to the consumption of contaminated eggs. Animal welfare concerns have ... Read more >>

Poult. Sci. (Poultry science)
[2014, 93(3):728-733]

Cited: 13 times

View full text PDF listing >>



Colonization of internal organs by Salmonella Enteritidis in experimentally infected laying hens housed in conventional or enriched cages.

Richard K Gast, Rupa Guraya, Deana R Jones, Kenneth E Anderson,

More human illnesses caused by Salmonella enterica subspecies enterica serovar Enteritidis throughout the world have been linked to the consumption of contaminated eggs than to any other food vehicle. Deposition of this pathogen in the edible contents of eggs occurs when systemic infections of laying hens involve colonization of reproductive ... Read more >>

Poult Sci (Poultry science)
[2013, 92(2):468-473]

Cited: 13 times

View full text PDF listing >>



Salmonella enteritidis deposition in eggs after experimental infection of laying hens with different oral doses.

Richard K Gast, Rupa Guraya, Jean Guard,

The continuing attribution of human Salmonella Enteritidis infections to internally contaminated eggs has necessitated the commitment of substantial public and private resources to Salmonella Enteritidis testing and control programs in commercial laying flocks. Cost-effective risk-reduction requires a detailed and comprehensive understanding of how Salmonella Enteritidis infections in hens result ... Read more >>

J Food Prot (Journal of food protection)
[2013, 76(1):108-113]

Cited: 16 times

View full text PDF listing >>



Single nucleotide polymorphisms that differentiate two subpopulations of Salmonella enteritidis within phage type.

Jean Guard, Cesar A Morales, Paula Fedorka-Cray, Richard K Gast,

BACKGROUND: Salmonella Enteritidis is currently the world's leading cause of salmonellosis, in part because of its ability to contaminate the internal contents of eggs. Previous analyses have shown that it is an exceptionally clonal serotype, which nonetheless generates considerable phenotypic heterogeneity. Due to its clonality, whole genome analysis is required ... Read more >>

BMC Res Notes (BMC research notes)
[2011, 4:369]

Cited: 31 times

View full text PDF listing >>



The relationship between the numbers of Salmonella Enteritidis, Salmonella Heidelberg, or Salmonella Hadar colonizing reproductive tissues of experimentally infected laying hens and deposition inside eggs.

Richard K Gast, Rupa Guraya, Jean Guard, Peter S Holt,

Contamination of eggs by Salmonella Enteritidis has been a prominent cause of human illness for several decades and is the focus of a recently implemented national regulatory plan for egg-producing flocks in the United States. Salmonella Heidelberg has also been identified as an egg-transmitted pathogen. The deposition of Salmonella strains ... Read more >>

Avian Dis. (Avian diseases)
[2011, 55(2):243-247]

Cited: 19 times

View full text PDF listing >>



Multiplication of Salmonella enteritidis in egg yolks after inoculation outside, on, and inside vitelline membranes and storage at different temperatures.

Richard K Gast, Rupa Guraya, Jean Guard, Peter S Holt,

Prompt refrigeration to restrict bacterial growth is important for reducing eggborne transmission of Salmonella enterica serovar Enteritidis (SE). The nutrient-rich yolk interior is a relatively infrequent location for initial SE deposition in eggs, but migration across the vitelline membrane can result in rapid bacterial multiplication during storage at warm temperatures. ... Read more >>

J Food Prot (Journal of food protection)
[2010, 73(10):1902-1906]

Cited: 5 times

View full text PDF listing >>



Colonization of avian reproductive-tract tissues by variant subpopulations of Salmonella enteritidis.

Jean Guard, Richard K Gast, Rupa Guraya,

Leghorn hens were infected with Salmonella Enteritidis cultures of known genomic content and subpopulation characteristics to determine comparative abilities to colonize the avian reproductive tract. Group 1 received phage-type (PT)4 22079, which is a dimorphic subpopulation that can both contaminate eggs and form biofilm. Group 2 received a 90:10 mixture ... Read more >>

Avian Dis. (Avian diseases)
[2010, 54(2):857-861]

Cited: 13 times

View full text PDF listing >>



Flow cytometric characterization of Peyer's patch and cecal tonsil T lymphocytes in laying hens following challenge with Salmonella enterica serovar Enteritidis.

Peter S Holt, Lara E Vaughn, Richard K Gast,

Two trials were conducted to determine T cell changes in Peyer's patches (PP) and cecal tonsils (CT) of specific-pathogen-free Single-Comb White Leghorn hens challenged with Salmonella enterica serovar Enteritidis (SE). Each week, crop lavage samples were obtained from 4 or 3 hens in Trials 1 and 2, respectively. These birds ... Read more >>

Vet Immunol Immunopathol (Veterinary immunology and immunopathology)
[2010, 133(2-4):276-281]

Cited: 8 times

View full text PDF listing >>



Cellular assessment of crop lymphoid tissue from specific-pathogen-free white leghorn chickens after Salmonella enteritidis challenge.

Lara E Vaughn, Peter S Holt, Richard K Gast,

The crop may be an important site along the upper alimentary tract in which a humoral immune response against Salmonella Enteritidis (SE) is elicited locally. The mucosal immune response within the crop (ingluvies) of specific-pathogen-free (SPF) white leghorn (WL) chickens against SE was investigated. Three trials were conducted using SPF ... Read more >>

Avian Dis (Avian diseases)
[2008, 52(4):657-664]

Cited: 1 time

View full text PDF listing >>



Multiplication of Salmonella enteritidis on the yolk membrane and penetration to the yolk contents at 30 degrees C in an in vitro egg contamination model.

Richard K Gast, Rupa Guraya, Jean Guard-Bouldin, Peter S Holt,

Refrigeration to limit bacterial multiplication is a critical aspect of efforts to control the transmission of Salmonella enterica serovar Enteritidis (SE) to consumers of contaminated eggs. Although the nutrient-rich yolk interior is an uncommon location for SE contamination in freshly laid, naturally contaminated eggs, migration across the vitelline membrane could ... Read more >>

J Food Prot (Journal of food protection)
[2008, 71(9):1905-1909]

Cited: 2 times

View full text PDF listing >>



Advertisement

Disclaimer
1.0163 s