Observations on the persistence and vertical transmission of<i>Salmonella enterica</i>serovars Pullorum and Gallinarum in chickens: Effect of bacterial and host genetic background

Berchieri, Ângelo; Murphy, C. K.; Marston, Kerrie L.; Barrow, Paul

doi:10.1080/03079450120054631

Cited by 139 publications

(142 citation statements)

References 27 publications

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“…Thus, SG propagation over long distances is probably unlikely to happen naturally. Moreover, horizontal transmission is thought to be the main route of SG propagation (Berchieri Junior et al, 2001). Commercial exchange of poultry would likely have taken place between these regions, and asymptomatic birds, harbouring this pathogen, could have been introduced into healthy poultry flocks.…”

Section: Discussionmentioning

confidence: 99%

“…Salmonella Pullorum (SP) triggers an illness, pullorum disease (PD), a severe systemic disease that generally results in high mortality only in young birds (Barrow & Freitas Neto, 2011;OIE, 2012). Some of the birds that recover from PD, or immunocompetent adult birds which generally do not present clinical disease, may develop a carrier state and bacteria may be thus transmitted vertically at sexual maturity (Berchieri Junior et al, 2001;Shivaprasad & Barrow, 2008). In Brazil, both FT and PD have decreased in incidence in commercial flocks since 1994 when the National Programme of Poultry Health (Programa Nacional de Sanidade Avícola -PNSA) was adopted and standard procedures towards poultry biosecurity established (Brazil, 2009).…”

Section: Introductionmentioning

confidence: 99%

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ERIC-PCR genotyping of field isolates ofSalmonella entericasubsp.entericaserovar Gallinarum biovars Gallinarum and Pullorum

et al. 2015

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Salmonella Gallinarum (SG) and Salmonella Pullorum (SP) have been classified as biovars belonging to Salmonella enterica subsp. enterica serovar Gallinarum. Genetic diversity among isolates of the same biovar can be detected by DNA fingerprinting techniques which are useful in epidemiological investigations. In this study, we applied the PCR amplification of Enterobacterial Repetitive Intergenic Consensus sequences (ERIC-PCR) to analyse 45 strains of SG and SP, most of which were isolated from diseased poultry of different Brazilian regions over a period of 27 years until 2014. The ERIC-genotypes obtained were used to describe the epidemiological relationship amongst the strains. Our findings showed that there were six ERIC-patterns for SG strains at 80% similarity. In addition, some of the SG isolates recovered from different regions and years clustered with 100% similarity, suggesting that transfer of genotypes between these regions has taken place. The commercial rough vaccine strain 9R showed a unique profile. Meanwhile, more genetic diversity was observed among SP strains where ten ERICpatterns were also formed at 80% similarity.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

ERIC-PCR genotyping of field isolates ofSalmonella entericasubsp.entericaserovar Gallinarum biovars Gallinarum and Pullorum

et al. 2015

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“…Salmonellosis is one of the main infections affecting commercial poultry, causing losses to poultry production, and posing a public health concern [1]. Salmonella, the causative agent for salmonellosis, are Gram negative, rod shaped, facultative anaerobic bacteria causing gastroenteritis [2].…”

Section: Introductionmentioning

confidence: 99%

Assessing the impact of bacteriophages in the treatment of Salmonella in broiler chickens

Nabil¹,

Tawakol²,

Hassan³

2018

Infection Ecology & Epidemiology

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Salmonellosis is one of the main bacterial infections affecting commercial poultry, causing losses to poultry production, and posing a public health concern.Samples from internal organs (liver, cecum and spleen) of one hundred diseased broiler chickens were collected and subjected to Salmonella isolation, identification and serotyping. S. typhimurium and S. enteritidis were selected from the isolated Salmonella to prepare bacteriophages from sewage water taken at broiler farms. An experimental infection of one day old specific pathogen free (SPF) chicks followed by treatment with the prepared bacteriophages isolated from both Salmonella was performed. Caecal samples from infected chicks were subjected at intervals to bacteriophage isolation and Salmonella quantitation. The effectiveness of bacteriophage treatments on Salmonella colonization in cecum of infected chicks increased after five successive doses. At 3 day post infection (dpi), cecal contents showed a marginal decrease in Salmonella loads with more reduction at 5 dpi. From 7 dpi to the end of the experiment at 15 dpi, all the chicks were cleared for both Salmonella.The findings of this study demonstrate that bacteriophage treatment is efficacious in reducing S. typhimurium and S. enteritidis colonization in broiler chickens within a short period and could be used as an alternative to antibiotics.

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“…The disease induced by infection with Salmonella enterica serovar Gallinarum in chickens is usually observed in adult birds, although the etiologic agent is very pathogenic for chickens of all ages (1,8). There is considerable information available on the biology of the microorganism and some aspects of its relationship with the host, although this is relatively elementary in nature (8,10,12).…”

Section: Introductionmentioning

confidence: 99%

Experimental infection of laying hens with Salmonella enterica serovar Gallinarum

Oliveira¹,

Berchieri²,

Fernandes³

2005

Braz. J. Microbiol.

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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.

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

Cited by 139 publications

References 27 publications

ERIC-PCR genotyping of field isolates ofSalmonella entericasubsp.entericaserovar Gallinarum biovars Gallinarum and Pullorum

ERIC-PCR genotyping of field isolates ofSalmonella entericasubsp.entericaserovar Gallinarum biovars Gallinarum and Pullorum

Assessing the impact of bacteriophages in the treatment of Salmonella in broiler chickens

Experimental infection of laying hens with Salmonella enterica serovar Gallinarum

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