In vitro invasion capacity of <i>Salmonella</i> Typhimurium <scp>DT</scp>9 isolates sourced from humans and layer hen environments

McWhorter, Andrea R.; Phan, Gilles; Hocking, Helen; Chousalkar, Kapil K.

doi:10.1111/zph.12434

Cited by 1 publication

(2 citation statements)

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“…In Australia, certain S . Typhimurium strains have been strongly associated with laying hen flocks and egg‐borne food poisoning outbreaks, and show invasive properties in tissue culture assays (Chousalkar et al., ) (McWhorter et al., ; Moffatt et al., ). It is not known if similar strains exist in Europe, but in the EU S .…”

Section: Assessmentmentioning

confidence: 99%

“…In oral and intravenous inoculation models, S. Heidelberg (a major serovar involved in egg and poultry meat contamination in the USA) and certain S. Typhimurium strains appeared to colonise the chicken reproductive organs as efficiently as S. Enteritidis, despite being recovered less frequently from egg contents (Gast et al, 2005(Gast et al, , 2007Gantois et al, 2008). In Australia, certain S. Typhimurium strains have been strongly associated with laying hen flocks and egg-borne food poisoning outbreaks, and show invasive properties in tissue culture assays (Chousalkar et al, 2018) (McWhorter et al, 2018Moffatt et al, 2016). It is not known if similar strains exist in Europe, but in the EU S. Typhimurium is much more frequently associated with pig, ruminant and environmental reservoirs than with chickens (Carson and Gavin et al, 2018;MacDonald et al, 2018).…”

Section: Reported Food-borne Salmonellosis Outbreaksmentioning

confidence: 99%

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Salmonella control in poultry flocks and its public health impact

Koutsoumanis¹,

Allende²,

Álvarez‐Ordóñez³

et al. 2019

EFS2

110

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An increase in confirmed human salmonellosis cases in the EU after 2014 triggered investigation of contributory factors and control options in poultry production. Reconsideration of the five current target serovars for breeding hens showed that there is justification for retaining Salmonella Enteritidis, Salmonella Typhimurium (including monophasic variants) and Salmonella Infantis, while Salmonella Virchow and Salmonella Hadar could be replaced by Salmonella Kentucky and either Salmonella Heidelberg, Salmonella Thompson or a variable serovar in national prevalence targets. However, a target that incorporates all serovars is expected to be more effective as the most relevant serovars in breeding flocks vary between Member State (MS) and over time. Achievement of a 1% target for the current target serovars in laying hen flocks is estimated to be reduced by 254,400 CrI 95 [98,540; 602,700] compared to the situation in 2016. This translates to a reduction of 53.4% CrI 95 [39.1; 65.7] considering the layer-associated human salmonellosis true cases and 6.2% considering the overall human salmonellosis true cases in the 23 MSs included in attribution modelling. A review of risk factors for Salmonella in laying hens revealed that overall evidence points to a lower occurrence in non-cage compared to cage systems. A conclusion on the effect of outdoor access or impact of the shift from conventional to enriched cages could not be reached. A similar review for broiler chickens concluded that the evidence that outdoor access affects the occurrence of Salmonella is inconclusive. There is conclusive evidence that an increased stocking density, larger farms and stress result in increased occurrence, persistence and spread of Salmonella in laying hen flocks. Based on scientific evidence, an impact of Salmonella control programmes, apart from general hygiene procedures, on the prevalence of Campylobacter in broiler flocks at the holding and on broiler meat at the end of the slaughter process is not expected.

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Section: Assessmentmentioning

confidence: 99%