Experimental Salmonella Gallinarum infection in light laying hen lines

Júnior, Â. Berchieri; Oliveira, Gláucia Helaine de; Pinheiro, Lucas Augusto Soeiro; Barrow, Paul

doi:10.1590/s1517-83822000000100012

Cited by 25 publications

(27 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At this point, Salmonella Gallinarum spread out rapidly through the population of adult birds, being present in the carcass and in the cloacae. These results suggest that the propensity towards disease-free carriage and the production of contaminated egg are less marked in susceptible birds, what agrees with previous studies (1,2), although similarities occur with the epidemiology of pullorum disease in different lines (10). In those birds that received the low dose no mortality occurred.…”

Section: Resultssupporting

confidence: 90%

Experimental infection of laying hens with Salmonella enterica serovar Gallinarum

Oliveira¹,

Berchieri²,

Fernandes³

2005

Braz. J. Microbiol.

Self Cite

View full text Add to dashboard Cite

Experimental infections were set up in commercial laying birds, comprising a white relatively resistant line and a red susceptible line infecting with Salmonella enterica serovar Gallinarum. The major findings were that in susceptible birds clinical disease occurred in a dose-dependent manner. Faecal excretion occurred in susceptible birds almost up to death but also occurred in the more resistant line and in birds, which were convalescing. Removal of birds, which had died from the disease, from the environment, reduced the resultant mortality/ morbidity and may be regarded as a useful measure for control.

show abstract

Section: Resultssupporting

confidence: 90%

Experimental infection of laying hens with Salmonella enterica serovar Gallinarum

Oliveira¹,

Berchieri²,

Fernandes³

2005

Braz. J. Microbiol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The host genetic background is known to have a considerable effect on the susceptibility to acute infection with S. Pullorum or S. Gallinarum both in in-bred (Bumstead & Barrow, 1993) and commercial lines (Berchieri et al, 2000). It is possible therefore that it also plays a role in localization in the reproductive tract, and this was also investigated in the present study.…”

Section: Introductionmentioning

confidence: 95%

Observations on the persistence and vertical transmission ofSalmonella entericaserovars Pullorum and Gallinarum in chickens: Effect of bacterial and host genetic background

Berchieri¹,

Murphy²,

Marston³

et al. 2001

Avian Pathology

139

126

View full text Add to dashboard Cite

“…Infection of poultry can lead to the development of clinical or subclinical symptoms, depending on the chicken variety, genetic resistance, immune response of the host and general nutritional and health status of the flock (FREITAS NETO et al, 2007). The infections by SG are usually acute, and the spread of the bacteria is more intense if carcasses of infected dead chickens are exposed to other chickens (BARROW et al, 1994;BERCHIERI JR. et al, 2000). SG can survive in the animal environment, and, due to the constant and slow horizontal transmission, the mortality is persistent in affected flocks, making it difficult to eradicate the infection (FEBERWEE et al, 2001b).…”

Section: Palavras-chavementioning

confidence: 99%

Protection of chickens against fowl typhoid using field vaccine programs formulated with the live attenuated strain Salmonella Gallinarum ΔcobSΔcbiA

et al. 2018

View full text Add to dashboard Cite

Salmonella enterica serovar Gallinarum biovar Gallinarum (SG) is a host-specific bacteria that causes the fowl typhoid (FT). This disease is highly pathogenic to commercial chickens, specially brown layers and breeders, causing acute septicemia followed by high morbidity and mortality. Vaccination is extensively adopted in the fields as a biosafety tool for prevention of isolated infections and outbreaks in commercial poultry flocks. The present study evaluated the use of an attenuated SG with deletions on genes cobS and cbiA (SGΔcobSΔcbiA) as a live vaccine, using vaccination schemes adjusted for field conditions. To this end, brown layers were used in two different experiments, to evaluate the long-term protection, necessary in the fields. The vaccination scheme on the first experiment consisted of two doses, the first at 4 th week-of-age and the booster dose at 8 th week-of-age with challenge at 16 th week-of-age with wild SG strain. On the second experiment, the vaccination was carried out by different routes using three doses of the live vaccine, at 4 th , 8 th and 12 th weeks-of-age, and the challenge was done at 20 th weeks-of-age. After the challenge, the mortality was recorded during 28 days, and the egg production (experiment 2) was evaluated and compared with the group of unvaccinated layers. In both experiments, the mortality was significantly reduced, and the egg production was not affected in vaccinated layer-hens. In summary, this study shows the efficacy and the protection of different vaccination schemes against FT that can be applied under field conditions in commercial poultry farms.

show abstract

Experimental Salmonella Gallinarum infection in light laying hen lines

Cited by 25 publications

References 14 publications

Experimental infection of laying hens with Salmonella enterica serovar Gallinarum

Experimental infection of laying hens with Salmonella enterica serovar Gallinarum

Observations on the persistence and vertical transmission ofSalmonella entericaserovars Pullorum and Gallinarum in chickens: Effect of bacterial and host genetic background

Protection of chickens against fowl typhoid using field vaccine programs formulated with the live attenuated strain Salmonella Gallinarum ΔcobSΔcbiA

Contact Info

Product

Resources

About